共 17 条
[1]
ALEXANDER JW, 1923, P NAT ACAD SCI US, V9
[2]
Alexandroff P., 1935, TOPOLOGIE, P3
[3]
ANDRONOV A, 1937, COMP REND ACC SC USS, V14
[4]
BENDIXON I, 1901, ACTA MATH, V24
[5]
CODDINGTON EA, 1955, ORDINARY DIFFERENTIA
[6]
DeBaggis H.F., 1952, CONTRIBUTIONS THEORY, V2, P37
[7]
DUFF GFD, 1953, ANN MATH, V57
[8]
DULAC H, 1923, B SOC MATH FRANCE, V51
[9]
Kerekjarto B., 1923, VORLESUNGEN TOPOLOGI
[10]
LANDIS EM, 1957, DOKL AKAD NAUK SSSR, V113