R. A. Shaffer

Physics Physique Fizika 3, 161 (1967) - Published 1 August, 1967

Susumu Okubo

Physics Physique Fizika 3, 165 (1967) - Published 1 August, 1967

E. Dubois-Violette and P. -G. de Gennes

Physics Physique Fizika 3, 181 (1967) - Published 1 August, 1967

David Markowitz

Physics Physique Fizika 3, 199 (1967) - Published 1 August, 1967

Philip C. Kwok

Physics Physique Fizika 3, 221 (1967) - Published 1 August, 1967