1. G. Monng:Ph. D.Thesis (Washington University, 1961).
2. A. I. Alikhanian, N. V. Shostakovich, A. T. Dadaian, V. N. Fedorov andB. N. Deriagin:Žurn. Ėksp. Teor. Fiz.,31, 955 (1956); Trans.Sov. Phys. JETP,4, 817 (1957).
3. Among the most recent reports are:N. D. Prasad, M. G. K. Menon andO. P. Sharma:Nuovo Cimento, 14, 1332 (1959);I. B. McDiarmid:Phys. Rev.,146, 1016 (1959);M. Conversi et al.: Nuovo Cimento,12, 130, 148 (1959);E. Bierman, R. Lea, J. Orear andS. Rosendorff:Phys. Rev.,113, 710 (1959). These contain references to earlier work.
4. B. F. Stearns:Ph. D. Thesis (Washington University, 1956);J. De Pagter andR. D. Sard:Phys. Rev., 118, 1353 (1960).
5. IBM Technical Newletter,11 (1956), Section V.