• [1]

    R. P. Feynman, Science, 183 (1972), 601.[2] R. F. Keam, Journ. Math, Phys., 10 (1969), 594.[3] M. Bohm et al., Nucl. Phys., 51B (1973), 397;D .Z. Winkel, Journ, Math. Phys, 16 (1975), 93.[4] 胡宁,科学通报,3 (1978), 129:朱重远、安瑛,科学通报,3 (1978) 154.[5] 冼鼎昌等,物理学报,27(1978), 94.[6] A. F. Antippa, A. E. Evertt and A. J. Phares., Nuovo Cimento., 43A (1978), 347.[7] 卡姆克,常微分方程手册,科学出版社,1977.