Laszlo Tisza."February 26, 1960." "Reprinted from Annals of Physics, volume 13, no.1, April 1961."Bibliography: p. 90-92.Army Signal Corps Contract No. DA36-039 sc-78108. Dept. of the Army Project No. 3-99-20-001 Project 3-99-00-000. U.S. Air Force Contract AF49(638)-95.