1. W. D. Jensen, F. B. Gerhard Jr., and D. M. Koffman, in Van Nostrand’s Scientific Encyclopedia, edited by G. D. Considine and P. H. Kulik (Wiley, New York, 2005), p. 1771.
2. Source brightness and useful beam current of carbon nanotubes and other very small emitters
3. Brightness measurements of a ZrO/W Schottky electron emitter in a transmission electron microscope
4. The effect of plasma density and emitter geometry on space charge limits for field emitter array electron charge emission into a space plasma
5. C. M. Marrese, J. E. Polk, K. L. Jensen, A. D. Gallimore, C. A. Spindt, R. L. Fink, and W. D. Palmer, in Micropropulsion for Small Spacecraft, edited by M. M. Micci and A. D. Ketsdever (American Institute of Aeronautics and Astronautics, Reston, VA, 2000), p. 18.