共 5 条
[1]
Andronov A., 1937, DOKL AKAD NAUK SSSR, V14, P247
[2]
Birkhoff G.D., 1927, DYNAM SYST, VVolume 9
[3]
MARKUS L, UNPUBLISHED
[4]
Peixoto M M, 1959, Proc Natl Acad Sci U S A, V45, P633, DOI 10.1073/pnas.45.4.633