共 11 条
[2]
Clarkson JA, 1936, T AM MATH SOC, V40, P396
[5]
Goebel K, 1973, B UNIONE MAT ITAL, V7, P67
[6]
Kannan R., 1971, FUND MATH, V70, P169
[7]
Krasnosel'skiic MA., 1955, USP MAT NAUK, V10, P123
[10]
Schaefer H., 1957, JBER DTSCH MATH VERE, V59, P131