-
[1]
S. Nakajima, Prog. theor. Phys.,20(1958), 948.[2] R. Zwanzig,Physica, 30 (1964), 721.[3] C. R. Willis, Phys. Rev., A9 (1974), 1343; General Relativity and Gravitation, 1 (1976),69.[4] H. Hofmann, P. J. Siemens, Nucl. Phys., A275 (1977). 464.[5] L. Van Hove, Physica, 21 (1955), 517; 23 (1957), 441.