1970
KuratovskiyMostovskiy - Set Theory ru
    FBB8CE322A9FC8E600D7E8381DC72934
    B605DE81BB056EAE48D59C82B651DB39
1966
Serpinskiy - About Set Theory ru
    2D938341E05F33D26D0AC9E75AD5AC82
1965
Bourbaki - Set Theory ru
    125022EF5DAA0E428CA80069E6D8FD86
1937
Hausdorf - Set Theory ru
    C19930839F871F31476C224EFC1B00F1