1) Kameyama, I. and P.J. Wilbur, "Zenith-Angle Distributions of Erosion Rates near High-Current Hollow Cathodes," 32nd Joint Propulsion Conference Paper AIAA 96-3208, July 1-3, 1996, Lake Buena Vista, FL.

1) Snyder, J.S. and P.J. Wilbur, "Measurement of Noise Produced by a Plasma Contactor Operating in Ground-Based Facilities," 31st Joint Propulsion Conference Paper AIAA 95-2830, July 10-12, 1995, San Diego, CA.

2) Wilbur, P.J. and J.S. Snyder, "Characteristics of Plasma Contactors for Spacecraft Charging Control," Proceedings of the Fourth International Conference of Tethers in Space," Smithsonian Institution, Washington, D.C., 10-14 April 1995, pp. 861-871.

3) Jongeward, G., I. Katz, B. Buchholtz, S. Snyder and P. Wilbur, "Conductive Nature of Low Frequency (f<1 MHz) Electromagnetic Fields Generated by a /Hollow Cathode Plasma Contactor," AIAA Paper 94-3313, Joint Propulsion Conference, June 1994, Indianapolis, IN.

4) Buchholtz, B.W., P.J. Wilbur, and C.K. Purvis, "An Experimental Investigation of Conducted and Radiated Emissions from a Hollow-Cathode Plasma Contactor," AIAA Paper 94-0333, AIAA Aerospace Sciences Meeting, Reno, NV, Jan. 1994.

5) Parks, D.E., Ira Katz, B. Buchholtz and P. Wilbur, "Expansion and electron emission characteristics of a hollow-cathode plasma contactor," J. Appl. Phys., V. 74, pp. 7094-7100, 1993.

6) Kameyama, I. and P.J. Wilbur, "Characteristics of Ions Emitted from High-Current Hollow Cathodes," Paper IEPC-93-023, Proceedings of 23rd International Electric Propulsion Conference, Seattle, WA., September 1993.

7) Buchholtz, B. and P.J. Wilbur, "An Investigation of Conducted and Radiated Emissions from a Hollow-Cathode Plasma Contactor," NASA CR-191173, July 1993.

8) Williams, J.D. and P.J. Wilbur, "Electron Emission from a Hollow-Cathode-Based Plasma Contactor," J. Spacecraft and Rockets, V. 29, No. 6, Nov. - Dec. 1992, pp. 820-829.

9) Friedly, V.J. and P.J. Wilbur, "High Current Hollow Cathode Phenomena," J. Prop. and Power, V. 8, No. 3, May-June 1992, pp. 635-643.

10) Wilbur P.J., "Plasma Contactor Research-1991," NASA CR-189140, April 1992.

11) Williams, J.D. and P.J. Wilbur, "Experimental Study of Plasma Contactor Phenomena," Russian Translation in Aero/Cosmocheskaya Techika, No. 11, Nov. 1991, pp. 3-10.

12) Williams, J.D. and P.J. Wilbur, "An Experimental Investigation of Hollow Cathode-Based Plasma Contactors," NASA CR-187120, May 1991.

13) Monheiser, J. M., J.D. Williams and P.J. Wilbur, "Plasma Contactor Get-Away- Special Experiment," AIAA Student Journal, V. 28, No. 4, Winter 1990/1991, pp. 22-23.

14) Williams, J.D. and P.J. Wilbur, "Plasma Contactor Research - 1990," NASA CR- 187097, Jan. 1991.

15) Williams, J.D. and P.J. Wilbur, "Experimental Study of Plasma Contactor Phenomena," J. Spacecraft and Rockets, V. 27, No. 6, Nov./Dec. 1990, pp. 634-641.

16) Friedly, V. and P.J. Wilbur, "High Current Hollow Cathode Phenomena," AIAA Paper 90-2587, July 1990.

17) Williams, J.D. and P.J. Wilbur, "Ground-Based Tests of Hollow Cathode Plasma Contactors," Proceedings of the Third International Conference on Tethers in Space, San Francisco, CA, May 1989, AIAA Publication CP892, pp. 77-87.

18) Wilbur, P.J. and J.D. Williams, "Laboratory Experiments on Plasma Contactors," appears in, "Current Collection from Space Plasmas," eds. N. Singh, K. H. Wright, Jr. and N. H. Stone, NASA CP 3089, April, 1989.

19) Williams, J.D. and P.J. Wilbur, "Plasma Contactor Research - 1988, NASA CR-182283, Feb. 1989.

20) Williams, J.D. and P.J. Wilbur, "Plasma Contacting - An Enabling Technology," AIAA Paper 89-0677, Aerospace Sciences Meeting, Jan. 1989, Reno, NV.

21) Vaughn, J.A. and P.J. Wilbur, "Characterization of Hollow Cathode, Ring Cusp Discharge Chambers," NASA CR-182255, Jan. 1989.

22) Vaughn, J.A. and P.J. Wilbur, "Ring Cusp/Hollow Cathode Discharge Chamber Performance Studies," Paper IEPC 88-064, 20th International Electric Propulsion Conference, Oct. 1988, Garmisch-Partenkirchen, West Germany.

23) Wilbur, Paul J., "Space Plasma Contactor Research - 1987," NASA CR-182148, Jan. 1988.

24) Williams, John D., Paul J. Wilbur and Jeff M. Monheiser, "Experimental Validation of a Phenomenological Model of the Plasma Contacting Process," Proceedings of the 2nd International Conference on Tethers, eds. L. Guerriero and I. Bekey, Oct. 1987, Venice, Italy, pp. 245-253.

25) Luebben, C.R. and P.J. Wilbur, "Hollow Cathodes for Arcjet Thrusters," AIAA Paper 87-1088, International Electric Propulsion Conference, May 13, 1987, Colorado Springs, Colorado.

26) Patterson, M.J. and P.J. Wilbur, "Plasma Contactors for Electrodynamic Tethers," Aerospace America, Vol. 25, No. 2, Feb. 1987, pp. 32-34.

27) Wilbur, P.J., "Advanced Electric Propulsion and Space Plasma Contactor Research," NASA CR-180862, Jan. 1987.

28) Wilbur, P.J. and J.D. Williams, "An Experimental Investigation of the Plasma Contacting Process," AIAA Paper 87-057, Jan. 12-15, 1987, Reno, Nevada.

29) Wilbur, P.J., "Hollow Cathode Plasma Coupling Study - 1986," NASA CR-171985, Dec. 1986.

30) Patterson, M.J. and P.J. Wilbur, "Plasma Contactors for Electrodynamic Tethers," NASA TM-88850, American Astronautical Society Paper 86-226; from NASA/AIAA/PSN International Conference on Tethers in Space, Sept. 1986. Also appears in Tethers in Space, V. 62, Advances in Astronautical Sciences, eds. P. M. Bainum et al, pp. 383-405.

31) Wilbur, P.J. and T.G. Laupa, "Plasma Contactor Design for Electrodynamic Tether Applications," Proceedings of Active Experiments Symposium, COSPAR, June 1986, Toulouse, France, appears in Adv. Space Res., Vol. 8, No. 1, pp. (1)211-(1)224, 1988.

32) Wilbur, P.J., "Advanced Electric Propulsion and Space Plasma Contactor Research," NASA CR-175119, Jan. 1986.

33) Wilbur, P.J. and Thomas G. Laupa, "Plasma Contractor Performance Comparisons," Proceedings of Applications of Tethers in Space Workshop, Venice, Italy, Oct. 15-17, 1985.

34) Wilbur, P.J., "Plasma Contactor Performance Characterization," Applications of Tethers in Space, NASA CP 2422, Oct. 1985, pp. 483-498.

35) Siegfried, D.S. and P.J. Wilbur, "A Model for Mercury Orificed Hollow Cathodes: Theory and Experiment," AIAA Journal, Vol. 22, No. 10 Oct. 1984, pp. 1405-1412.

36) Siegfried, D.E. and P.J. Wilbur, "Phenomenological Model for Orified Hollow Cathodes," NASA CR-168026, Dec. 1982.

37) Siegfried, D.E. and P.J. Wilbur, "Phenomenological Model Describing Orificed, Hollow Cathode Operation," AIAA Journal, Vol. 21, No. 1, Jan. 1983, pp. 5-6.

38) Siegfried, D.S. and P.J. Wilbur, "A Model for Mercury Orificed Hollow Cathodes: Theory and Experiment", AIAA Paper No. 82-1889, Nov. 1982.

39) Siegfried, D.E. and P.J. Wilbur, "Studies on an Experimental Quartz Tube Hollow Cathode", appears in Electric Propulsion and its Application to Space Missions, v. 79 of Progress in Astronautics and Aeronautics, 1981, pp. 262-277.

40) Brophy, J.R. and P.J. Wilbur, "Electron Diffusion through the Baffle Aperture of a Hollow Cathode Thruster", appears in Electric Propulsion and its Application to Space Missions, v. 79 of Progress in Astronautics and Aeronautics, 1981, pp. 159-172.

41) Siegfried, D.E. and P.J. Wilbur, "A Phenomenological Model Describing Orificed, Hollow Cathode Operation," AIAA Paper No. 81-0746, April 1981.

42) Brophy, J.R. and P.J. Wilbur, "Design Model for the Baffle Aperture Region of a Hollow Cathode Thruster," AIAA Paper No. 81-0758, April 1981.

43) Brophy, J.R., and P.J. Wilbur, "Baffle Aperture Design Study of Hollow Cathode Equipped Ion Thrusters," NASA CR-165164, Oct. 1980.

44) Brophy, J.R. and P.J. Wilbur, "Electron Diffusion Through the Baffle Aperture of a Hollow Cathode Thruster," AIAA Paper 79-2060, Oct. 1979.

45) Siegfried, D. and P.J. Wilbur, "Studies on an Experimental Quartz Tube Hollow Cathode," AIAA Paper 79-2056, Oct. 1979.

46) Siegfried, D.E., and P.J. Wilbur, "An Investigation of Mercury Hollow Cathode Phenomena," AIAA Paper 78-705, April 1978.

47) Graf, J.E. and P.J. Wilbur, "Photographic Study of an Operating Hollow Cathode," AIAA Paper 75-394, March 19-21, 1975.

48) Wilbur, Paul J., "Effects of the Hollow Cathode Discharge on Throttled Ion Thruster Performance," Journal of Spacecraft and Rockets, Vol. 10, No. 1, p. 3, January 1973.

49) Wilbur, P.J., "Effects of the Hollow Cathode Discharge on Throttled Ion Thruster Performance," AIAA 9th Electric Propulsion Conference (1972), AIAA Paper No. 72-421, April 1972.

50) Wilbur, Paul J., "An Experimental Investigation of a Hollow Cathode Discharge," NASA CR-12037, December 1971.