1. Etemadi M., Inan O.T., GiovangrandiL., and KovacsG.T.A., "Rapid Assessment Of Cardiac Contractility On A Home Bathroom Scale", IEEE Transactions on Information Technology in BioMedicine, In Press. 
  2. Wiard R. M., Inan, O.T., Argyres B., Etemadi M., Kovacs G. T. A., and Giovangrandi L., "Automatic Detection of Motion Artifacts in the Ballistocardiogram Measured on a Modified Bathroom Scale", Medical and Biological Engineering and Computing, Accepted.
  3. Inan O.T., Kovacs G.T.A., and Giovangrandi L., "Evaluating the Lower-body Electromyogram Signal Acquired from the Feet as a Noise Reference for Standing Ballistocardiogram Measurements", IEEE Transactions on Information Technology in BioMedicine, 14(5), 1188-1196, 2010.
  4. Chen M.Q., Whittington R.H., Day P.W., Kobilka B.K., Giovangrandi L., and Kovacs G.T.A., "A Device for Separated and Reversible Co-culture of Cardiomyocytes", Biotechnology Progress, 26(4), 1164-1171, 2010.
  5. Inan O.T. and Kovacs G.T.A., "A Low-Noise AC-Bridge Amplifier for Ballistocardiogram Measurement on an Electronic Weighing Scale," IOP Physiological Measurement, v. 31, no. 7, pp. N51-59, 2010.
  6. Inan O.T. and Kovacs G.T.A., "An 11 micro-Watt, Transimpedance-Based Biosignal Amplifier with Active Current Feedback Stabilization," IEEE Transactions on Biomedical Circuits and Systems, v. 4,no. 2, pp. 93-100, 2010.
  7. Inan, O. T., M. Etemadi, B. Widrow, and G. T. A. Kovacs, "Adaptive cancellation of floor vibrations in standing ballistocardiogram measurements using a seismic sensor as a noise reference," IEEE Transactions on Biomedical Engineering, 57(3), pp.722-727, 2010.
  8. Chen M.Q., Xie X., Wilson K.D., Giovangrandi L., Wu J.C., and Kovacs G.T.A., "Electrical Point-Source Stimulation of Embryonic Stem Cells for Cardiac Repair", Cellular and Molecular Bioengineering, 2(4), 625-635, 2009.Inan, O. T., M. Etemadi, M.E. Sanchez, O. Marcu, S. Bhattacharya, and G. T. A. Kovacs, "A miniaturized video system for monitoring the locomotor activity of Drosophila melanogaster in space and terrestrial settings," IEEE Transactions on Biomedical Engineering, 56(2), 522-524, 2009.
  9. Inan, O. T., M. Etemadi, A. Paloma, G. T. A. Kovacs, L. Giovangrandi, "Non-Invasive Measurement of Cardiac Output Changes during Exercise Recovery on a Bathroom Scale Based Ballistocardiograph", Physiological Measurement, vol. 30, no. 3, pp. 261-274, 2009.
  10. Inan, O. T., M. Etemadi, R. M. Wiard, L. Giovangrandi, and G. T. A. Kovacs, "Robust Ballistocardiogram Acquisition for Home Monitoring," Physiological Measurement, vol. 30, no. 2, pp. 169-185, 2009.
  11. Li, J.J., Ouellette, A.L., Giovangrandi, L., Cooper, D.E., Ricco, A.J., and Kovacs, G.T.A., "Optical Scanner for Immunoassays with Up-Converting Phosphorescent Labels", IEEE Transactions in Biomedical Engineering, 55(5), 1560-1571, 2008.
  12. Whittington, R.H. , Kovacs, G.T.A., "Temporal A Discrete-Time Control Algorithm Applied to Closed-Loop Pacing of HL-1 Cardiomyocytes," IEEE Transactions on Biomedical Engineering, vol 55, issue 1, pp. 21-30, 2008.
  13. Inan, O.T., Giovangrandi, L., Kovacs, G.T.A., "Robust neural-network based classification of premature ventricular contractions using wavelet transform and timing interval features," IEEE Transactions on Biomedical Engineering, 53(12), 2507-2515, 2006.
  14. Giovangrandi, L., Gilchrist, K. H., Whittington, R. H., and Kovacs, G. T. A., "Low-Cost Microelectrode Array with Integrated Heater for Extracellular Recording of Cardiomyocyte Cultures Using Commercial Flexible Printed Circuit Technology," Sensors and Actuators B: Chemical, 113, 545-554, 2006.
  15. Mundt, C.W., Montgomery, K.N., Udoh, U.E., Barker, V.N., Thonier, G.C., Tellier, A.M., Ricks, R.D., Darling, R.B., Cagle, Y.D., Cabrol, N.A., Ruoss, S.J., Swain, J.L., Hines, J.W., Kovacs, G.T.A., "A Multiparameter Wearable Physiologic Monitoring System for Space and Terrestrial Applications," IEEE Transactions on Information Technology in Biomedicine, vol 9, no. 3, Sept. 2005, pp. 382 - 391.
  16. Whittington, R. H., Giovangrandi, L., and Kovacs, G. T. A., "A Closed-Loop Electrical Stimulation System for Cardiac Cell Cultures," IEEE Transactions on Biomedical Engineering, vol. 52, no. 7, July 2005, pp. 1261 - 1270.
  17. Lange, D., Storment, C. W., Conley, C. A., and Kovacs, G. T. A., "A Microfluidic Shadow Imaging System for the Study of the Nematode Caenorhabditis elegans in Space," Sensors and Actuators B, vol. 107, June 2005, pp. 904 - 914.
  18. Gilchrist, K. H., Giovangrandi, L., Whittington, R. H., and Kovacs, G. T. A., "Sensitivity of Cell-Based Biosensors to Environmental Variables," Biosensors and Bioelectronics, vol. 20, no. 7, Jan. 2005, pp. 1397 - 1406.
  19. Droitcour, A.D., Boric-Lubecke, O., Lubecke, V. M., Lin, J., and Kovacs, G. T. A., "Chest motion sensing with modified silicon base station chips," IEICE Transactions on Electronics, Special Issue on Wave Technologies for Wireless and Optical Communications, vol. E87-C, no. 9, September 2004, pp. 1524 - 1531. (invited paper)
  20. Droitcour, A. D., Boric-Lubecke, O., Lubecke, V. M., Lin, J., and Kovacs, G. T. A., "Range Correlation and I/Q Performance Benefits in Single-Chip Silicon Doppler Radars for Noncontact Cardiopulmonary Monitoring," IEEE Transactions on Microwave Theory and Techniques, vol. 52, no. 3, Mar. 2004, pp. 838 - 848.
  21. Kovacs, G. T. A., "Electronic Sensors with Living Cellular Components," Proceedings of the IEEE, vol. 91, no. 6, June 2003, pp. 915 - 929.
  22. Freiwald, W. A., Stemmann, H., Wannig, A., Kreiter, A. K., Hofmann, U. G., Hills, M. D., Kovacs, G. T. A., Kewley, D. T., and Bower, J. M., "Stimulus Representation in Rat Primary Visual Cortex: Multi-Electrode Recordings with Micromachined Silicon Probes and Estimation Theory," Neurocomputing, vol. 44 - 46, June 2002, pp. 407 - 416.
  23. Mourlas, N. J., Gilchrist, K. H., Giovangrandi, L., Maluf, N. I., and Kovacs, G. T. A., "An In-Line Osmometer for Application to a Cell-Based Biosensor System," Sensors and Actuators B: Chemical, vol. 83, Mar. 2002, pp. 41 - 47.
  24. Goldberg, J. L., Espinosa, J. S., Xu, Y., Davidson, N., Kovacs, G. T. A., and Barres, B. A., "Retinal Ganglion Cells Do Not Extend Axons by Default: Promotion by Neurotrophic Signaling and Electrical Activity," Neuron, vol. 33, Feb. 28, 2002, pp. 689-702.
  25. Terry, M., Reiter, J., Böhringer, K. F., Suh, J. W., and Kovacs, G. T. A., "A Docking System for Microsatellites Based on MEMS Actuator Arrays," Smart Materials and Structures, vol. 10, no. 6, Dec. 2001, pp. 1176 - 1184.
  26. Aravanis, A. M., DeBusschere, B. D., Chruscinski, A. J., Gilchrist, K. H., Kobilka, B. K., and Kovacs, G. T. A., "A Genetically Engineered Cell-Based Biosensor for Functional Classification of Agents," Biosensors and Bioelectronics, vol. 16, Sept. 2001, pp. 571 - 577.
  27. Gilchrist, K. H., Barker, V. N., Fletcher, L. E., DeBusschere, B. D., Ghanouni, P., Giovangrandi, L., and Kovacs, G. T. A., "General Purpose, Field-Portable Cell-Based Biosensor Platform," Biosensors and Bioelectronics, vol. 16, Sept. 2001, pp. 557 - 564.
  28. DeBusschere, B. D., and Kovacs, G. T. A., "Portable Cell-Based Biosensor System Using Integrated CMOS Cell-Cartridges," Biosensors and Bioelectronics, vol. 16, Sept. 2001, pp. 543 - 556.
  29. Honer, K. A., and Kovacs, G. T. A., "Integration of Sputtered Silicon Microstrutures with Pre-Fabricated CMOS Circuitry," Sensors and Actuators A Physical, vol. 91, no. 3, July 15, 2001, pp. 386 - 397.
  30. Taylor, M. T., Belgrader, P., Furman B. J., Pourahmadi, F., Kovacs, G. T. A., and Northrup, M. A., "Lysing Bacterial Spores by Sonication Through a Flexible Interface in a Microfluidic System," Analytical Chemistry, Feb. 2001, vol. 73, no. 3, pp. 492-496.
  31. Kane, B. J., Cutkosky, M. R., and Kovacs, G. T. A., "A Traction Stress Sensor Array for Use in High-Resolution Robotic Tactile Imaging," IEEE/ASME Journal of Microelectromechanical Systems, Dec. 2000, vol. 9, no. 4, pp. 425 - 434.
  32. Suh, J. W., Darling, R. B., Böhringer, K.-F., Donald, B. R., Baltes, H., and Kovacs, G. T. A., "CMOS Integrated Ciliary Actuator Array as a General-Purpose Micromanipulation Tool for Small Objects," IEEE/ASME Journal of Microelectromechanical Systems, Dec. 1999, vol. 8, no. 4, pp. 483 - 496.
  33. Gray, B. L., Jaeggi, D., Mourlas, N. J., van Drieënhuizen, B. P., Williams, K. R., Maluf, N. I., and Kovacs, G. T. A., "Novel Interconnection Technologies for Integrated Microfluidic Systems," Sensors and Actuators A, vol. 77, no. 1, Sept. 28, 1999, pp. 57 - 65. 47. Suh, J. W., Darling, R. B., Böhringer, K.-F., Donald, B. R., Baltes, H., and Kovacs, G. T. A., "CMOS Integrated Ciliary Actuator Array as a General-Purpose Micromanipulation Tool for Small Objects," IEEE/ASME Journal of Microelectromechanical Systems, Dec. 1999, vol. 8, no. 4, pp. 483 - 496.
  34. Belgrader, P., Hansford, D., Kovacs, G. T. A., Venkateswaran, K., Mariella, R., Milanovich, F., Nasarabadi, S., Okuzumi, M., Pourahmadi, F., and Northrup, M. A., "A Minisonicator to Rapidly Disrupt Bacterial Spores for DNA Analysis," Analytical Chemistry, vol. 71, no. 19, Oct. 1, 1999, pp. 4232 - 4236.
  35. Partridge, A., Reynolds, J. K., Grade, J. D., Kane, B. J., Maluf, N. I., Kovacs, G. T. A., and Kenny, T. W., "An Integrated Controller for Tunnel Sensors," IEEE Journal of Solid State Circuits, vol. 34, no. 8, Aug. 1999, pp. 1099-1107.
  36. Pancrazio, J. J., Bey, P. P., Jr., Cuttino, D. S., Kusel, J. K., Borkholder, D. A., Shaffer, K. M., Kovacs, G. T. A., and Stenger, D. A., "Portable Cell-Based Biosensor System for Toxin Detection," Sensors and Actuators B Chemical, vol. 53, no. 3, Dec. 1998, pp. 179 - 185.
  37. Pancrazio, J. J., Bey, P. P., Loloee, A., Manne, S., Chau, H.-C., Howard, L. H., Gosney, W. M., Borkholder, D. A., Kovacs, G. T. A., Manos, P., Cuttino, D. S., and Stenger, D. A., "Description and Demonstration of a CMOS Amplifier-Based-System with Measurement and Stimulation Capability for Bioelectrical Signal Transduction," Biosensors and Bioelectronics, vol. 13, Oct. 15, 1998, pp. 971-979.
  38. Flannery, A. F., Mourlas, N. J., Storment, C. W., Tsai, S., Tan, S. H., Heck, J., Monk, D., Gogoi, B., and Kovacs, G. T. A., "PECVD Silicon Carbide as a Chemically Resistant Material for Micromachined Transducers," Sensors and Actuators A, vol. 70, nos. 1 - 2, Oct. 1998, pp. 48 - 55.
  39. Petersen, K. E., McMillan, W. A., Kovacs, G. T. A., Northrup, M. A., Christel, L. A., and Pourahmadi, F., "Toward Next Generation Clinical Diagnostic Instruments Scaling and New Processing Paradigms," Journal of Biomedical Microdevices, vol. 1, no. 1, Sept. 1998, pp. 71 - 79.
  40. Kovacs, G. T. A., Maluf, N. I., and Petersen, K. E., "Bulk Micromachining of Silicon," Proceedings of the IEEE, vol. 86, no. 8, Aug. 1998, pp. 1536 - 1551.
  41. Darling, R. B., Suh, J. W., and Kovacs, G. T. A., "Ciliary Microactuator Array for Scanning Electron Microscope Positioning Stage," Journal of Vacuum Science & Technology A (Vacuum, Surfaces, and Films), May - June 1998, vol. 16, no. 3, p. 1998 - 2002.
  42. Jung, D. R., Cuttino, D.S., Pancrazio, J. J., Manos, P., Cluster, T., Sathanoori, R. S., Aloi, L. E., Coulombe, M. G., Bey, P., Czarnaski, M. A., Borkholder, D. A., Kovacs, G. T. A., Bey, P., Stenger, D. A., Hickman, J. J., "Cell-Based Sensor Microelectrode Array Characterized by Imaging X-ray Photoelectron Spectroscopy, Scanning Electron Microscopy, Impedance Measurements, and Extracellular Recordings," Journal of Vacuum Science & Technology A (Vacuum, Surfaces, and Films), May - June 1998, vol. 16, no. 3, p. 1183 - 1188.
  43. Zhao, H., Dadoo, R., Reay, R. J., Kovacs, G. T. A., and Zare, R. N., "Electrically Floating Conductivity Detection System for Capillary Electrophoresis," Journal of Chromatography A, vol. 813 (#1), July 10, 1998, pp. 205 - 208.
  44. Herdan, J., Feeney, R., Kounaves, S. P., Flannery, A. F., Storment, C. W., Kovacs, G. T. A., and Darling, R. B., "Field Evaluation of an Electrochemical Probe for In Situ Screening of Heavy Metals in Groundwater," Environmental Science and Technology, vol. 32, no. 1, Jan. 1, 1998, pp. 131-136.
  45. Borkholder, D. A., Bao, J., Maluf, N. I., Perl, E. R., and Kovacs, G. T. A., "Microelectrode Arrays for Stimulation of Neural Slice Preparations," Journal of Neuroscience Methods, vol. 77, 1997, pp. 61 - 66.
  46. Bohringer, K. F., Donald, B. R., MacDonald, N. C., Kovacs, G. T. A., and Suh, J. W., "Computational Methods for Design and Control of MEMS Micromanipulator Arrays," IEEE Computational Science and Engineering, vol. 4, no. 1, Jan.-March 1997, pp. 17 - 29.
  47. Della Santina, C. C., Kovacs, G. T. A., and Lewis, E. R., "Multi-Unit Recording from Regenerated Bullfrog Eighth Nerve Using Implantable Silicon-Substrate Microelectrodes," Journal of Neuroscience Methods, vol. 72, no. 1, 1997, pp. 71 - 86.
  48. Kewley, D. T., Hills, M. D., Borkholder, D. A., Opris, I. E., Maluf, N. I., Storment, C. W., Bower, J. M., and Kovacs, G. T. A., "Plasma-Etched Neural Probes," Sensors and Actuators A, vol. 58, no. 1, Jan. 1997, pp. 27 - 35.
  49. Klaassen, E. H., and Kovacs, G. T. A., "Integrated Thermal Conductivity Vacuum Sensor," Sensors and Actuators A, vol. 58, no. 1, Jan. 1997, pp. 37 - 42.
  50. Klaassen, E. H., Reay, R. J., Storment, C. W., and Kovacs, G. T. A., "Micromachined Thermally Isolated Circuits," Sensors and Actuators A, vol. 58, no. 1, Jan. 1997, pp. 43 - 50.
  51. Suh, J. W., Glander, S. F., Darling, R. B., Storment, C. W., and Kovacs, G. T. A., "Organic Thermal and Electrostatic Ciliary Microactuator Array for Object Manipulation," Sensors and Actuators A, vol. 58, no. 1, Jan. 1997, pp. 51 - 60.
  52. Yee, G. M., Maluf, N. I., Hing, P. A., Albin, M. I., and Kovacs, G. T. A., "Miniature Spectrometers for Biochemical Analysis," Sensors and Actuators A, vol. 58, no. 1, Jan. 1997, pp. 61 - 66.
  53. Opris, I. E. and Kovacs, G. T. A., "A Rail-to-Rail Ping-Pong Op-Amp," IEEE Journal of Solid-State Circuits, vol. 31, no. 9, Sept. 1996, pp. 1320 - 1324.
  54. Reay, R. J., Storment, C. W., Flannery, A. F., Kounaves, S. P., and Kovacs, G. T. A., "Microfabricated Electrochemical Analysis System for Heavy Metal Detection," Sensors and Actuators B, vol. 34, no. 1 - 3, Aug. 1996, pp. 450 - 455.
  55. Kovacs, G. T. A., Petersen, K., and Albin, M., "Silicon Micromachining," Analytical Chemistry, vol. 68, July 1, 1996, pp. 407A - 412A.
  56. Kane, B. J., Cutkosky, M. R., and Kovacs, G. T. A., "CMOS-Compatible Traction Stress Sensor for Use in High-Resolution Tactile Imaging," Sensors and Actuators A, vol. 54, nos. 1 - 3, June 1996, pp. 511 - 516.
  57. Klaassen, E. H., Petersen, K., Noworolski, J. M., Logan, J., Maluf, N. I., Brown, J., Storment, C., McCulley, W., and Kovacs, G. T. A., "Silicon Fusion Bonding and Deep Reactive Ion Etching," Sensors and Actuators A, vol. 52, no. 1 - 3, March - April 1996, pp. 132 - 139.
  58. Maluf, M. I., Reay, R. J., and Kovacs, G. T. A., "High-Voltage Devices and Circuits Fabricated Using Foundry CMOS for Use With Electrostatic MEM Actuators," Sensors and Actuators A, vol. 52, no. 1 - 3, March - April 1996, pp. 187 - 192.
  59. Klaassen, E. H., Reay, R. J. and Kovacs, G. T. A., "Diode-Based Thermal RMS Converter with On-Chip Circuitry Fabricated Using Standard CMOS Technology," Sensors and Actuators A, vol. 52, no. 1 - 3, March - April 1996, pp. 33 - 40.
  60. Honer, K. A., Maluf, N. I., Martinez, E., and Kovacs, G. T. A., "Characterizing Deflectable Microstructures Via a High-Resolution Laser-Based Measurement System," Sensors and Actuators A, vol. 52, no. 1 - 3, March - April 1996, pp. 12 - 17.
  61. Reay, R. J., Klaassen, E. H., and Kovacs, G. T. A., "A Micromachined Low-Power Temperature-Regulated Bandgap Voltage Reference," IEEE Journal of Solid-State Circuits, vol. 30, no. 12, Dec. 1995, pp. 1374 - 1381.
  62. Jackson, D., Kane, B. J., Monroe, S., Li, J., Storment, C. W., Kovacs, G. T. A., and Tanelian, D. L., "A Feedback Controlled Silicon Microprobe for Quantitative Mechanical Stimulation of Nerve and Tissue," Journal of Neuroscience Methods, vol. 60, no. 1 - 2, Aug. 1995, pp. 157 - 163.
  63. Kane, B. J., Storment, C. W., Crowder, S. W., Tanelian, D. L., and Kovacs, G. T. A., "Force-Sensing Microprobe for Precise Stimulation Of Mechanosensitive Tissues," IEEE Transactions on Biomedical Engineering, vol. 42, no. 8, Aug. 1995, pp. 745 - 750.
  64. Reay, R. J., and Kovacs, G. T. A., "An Unconditionally Stable Two-Stage CMOS Amplifier," IEEE Journal of Solid-State Circuits, vol. 30, no. 5, May 1995, pp. 591 - 594.
  65. Opris, I., and Kovacs, G. T. A., "Large-Signal Subthreshold CMOS Transconductance Amplifier," Electronics Letters, vol. 31, no. 9, Apr. 27, 1995, pp. 718 - 720.
  66. Kovacs, G. T. A., Storment, C. W., and Kounaves, S. P., "Microfabricated Heavy Metal Ion Sensor," Sensors and Actuators B: Chemical, vol. 23, no. 1, Jan. 1995, pp. 41 - 47.
  67. Opris, I. E., and Kovacs, G. T. A., "Voltage-Mode Defuzzification Circuits," International Journal of Electronics, vol. 77, no. 6, Dec. 1994, pp. 1043 - 1057.
  68. Reay, R. J., Klaassen, E. H., and Kovacs, G. T. A., "Thermally and Electrically Isolated Single Crystal Silicon Structures in CMOS Technology," IEEE Electron Device Letters, vol. 15, no. 10, Oct. 1994, pp. 399 - 401.
  69. Storment, C. W., Borkholder, D. A., Westerlind, V., Suh, J. W., Maluf, N. I., and Kovacs, G. T. A., "Flexible, Dry-Released Process for Aluminum Electrostatic Actuators," IEEE/ASME Journal of Microelectromechanical Systems, Sept. 1994, vol. 3, no. 3, pp. 90 - 96.
  70. Opris, I., and Kovacs, G. T. A., "An Analogue Median Circuit, Electronics Letters," Aug. 18, 1994, vol. 30, no. 17, pp. 1369 - 1370.
  71. Opris, I., and Kovacs, G. T. A., "A Fast Precision Voltage Rectifier, Electronics Letters," Aug. 4, 1994, vol. 30, no. 16, pp. 1269 - 1270.
  72. Maluf, N. I., McNutt, E. L., Monroe, S., Tanelian, D. L., and Kovacs, G. T. A., "A Thermal Signal Generator Probe for the Study of Neural Thermal Transduction," IEEE Transactions on Biomedical Engineering, July 1994, vol. 41, no. 7, pp. 649 - 655.
  73. Kovacs, G. T. A., Storment, C. W., Halks-Miller, M., Belczynski, C. R., Della Santina, C. C., Lewis, E. R., and Maluf, N. I., "Silicon-Substrate Microelectrode Arrays for Parallel Recording of Neural Activity in Peripheral and Cranial Nerves," IEEE Transactions on Biomedical Engineering, June 1994, vol. 41, no. 6, pp. 567 - 577.
  74. Opris, I., and Kovacs, G. T. A., "An Improved Analogue Median Filter, Electronics Letters," Feb. 17, 1994, vol. 30, no. 4, pp. 284 - 285.
  75. Kounaves, S. P., Deng, W., Kovacs, G. T. A., and Storment, C. W., "A Microlithographically Fabricated Iridium-Based Mercury Ultramicroelectrode Array and its Application to SWASV Analysis of Metal Ions in Natural Waters," Journal of Analytical Chemistry, vol. 66, no. 3, Feb. 1, 1994, pp. 418 - 423.
  76. Martinoia, S., Bove, M., Carlini, G., Ciccarelli, C., Grattarola, M., Storment, C., and Kovacs, G., "A General-Purpose System for Long-Term Recording from a Microelectrode Array Coupled to Excitable Cells," Journal of Neuroscience Methods, June 1993, vol. 48, no. 1-2, pp. 115-121.
  77. Balteanu, F., Opris, I., and Kovacs, G., "Current-Mode Fuzzy Memory Element, Electronics Letters," Jan. 1993, vol. 29, no. 2, pp. 236-237.
  78. Kovacs, G. T. A., Storment, C. W., and Rosen, J. M., "Regeneration Microelectrode Array for Peripheral Nerve Recording and Stimulation," IEEE Transactions on Biomedical Engineering, Sept. 1992, vol. 39, no. 9, pp. 893-902.
  79. Liang, D. H., Kovacs, G. T. A., Storment, C. W., and White, R. L., "A Method for Evaluating the Selectivity of Electrodes Implanted for Nerve Stimulation," IEEE Transactions on Biomedical Engineering, vol. 38, no. 5, May 1991, pp. 443-449.