共 13 条
[1]
BERLINE C, 1980, LECT NOTES MATH, V859, P16
[2]
BOFFA M, 1980, LECT NOTES MATH, V834, P20
[3]
CHERLIN GL, 1991, J LOND MATH SOC, V44, P102
[4]
CHERLIN GL, 1982, LOG C 1980, P69
[5]
Fraisse R., 1954, ANN ECOLE NORMALE SU, V71, P363
[6]
GRUENBERG KW, 1970, LECTURE NOTES MATH, V143
[7]
HUGHES NJS, 1951, P AM MATH SOC, V2, P742
[9]
MACLANE S, 1963, GRUNDLEHREN MATH WIS, V114