共 8 条
[5]
Levin J.J., 1963, P AM MATH SOC, V14, P435, DOI [10.2307/2034270, https://doi.org/10.1090/S0002-9939-1963-0152852-8, DOI 10.1090/S0002-9939-1963-0152852-8]
[8]
YOSHIZAZA T, 1966, MATH SOC JAPAN