共 15 条
[1]
ANDRONOV A, 1945, THEORY OSCILLATIONS, pCH6
[3]
KUPKA I, 1963, CONT DIFF EQ, V2, P451
[4]
MARCUS L, 1963, AM J MATH, V85, P633
[5]
Peixoto M., 1962, TOPOLOGY, VI, P101, DOI 10.1016/0040-9383(65)90018-2
[7]
SACKER RJ, 1964, IMMNYU333 NEW YORK U
[9]
Smale S., 1963, ANN SCUOLA NORM-SCI, V17, P97
[10]
Smale S, 1960, B SOC MAT MEX, V5, P195