共 6 条
[1]
Gershun A., 1939, J MATH PHYS, V18, P51, DOI [DOI 10.1002/SAPM193918151, 10.1002/sapm193918151]
[2]
HILL MN, 1962, SEA ED, V1, P445
[6]
TYLER JE, 1962, SEA, V1, P445