共 6 条
[1]
Antoine P., 1966, B SOC MATH BELG, V18, P142
[2]
Birkhoff G., 1967, LATTICE THEORY, V25
[3]
HEDRLIN Z, 1966, COMMENT MATH U CAROL, V7, P377
[4]
MACLANE S, 1971, GRADUATE TEXTS MATHE, V5
[6]
Sabidussi G., 1974, COLL MATH SOC JANOS, VIII, P1199