Richard L. Garwin and André Landesman
Physics Physique Fizika 2, 107 (1965) - Published 1 November, 1965
P. N. Argyres
Physics Physique Fizika 2, 131 (1965) - Published 1 November, 1965
M. Bolsterli and J. MacKenzie
Physics Physique Fizika 2, 141 (1965) - Published 1 November, 1965