共 4 条
[1]
ITIHARA T, 1933, TOHOKU MATH J, V37, P209
[2]
MCMILLAN B, 1939, J MATH PHYS, V18, P28
[3]
POPKEN J, 1950, MATH REV, V11, P331
[4]
1949, B AM MATH SOC, V55, P954