共 6 条
[2]
Penrose R., 1959, P CAMB PHILOS SOC, V55, P137
[3]
Sherwin CW, 1961, AM J PHYS, V29, P67
[5]
Weinstein R., 1960, AM J PHYS, V28, P607, DOI [10.1119/1.1935916, DOI 10.1119/1.1935916]