[1] Cieutat P. On the structure of the set of bounded solutins on an almost periodic Li\'{e}nard equations. Nonlinear Analysis, 2004, 58: 885--898
[2] 何崇佑. 概周期微分方程. 北京:高等教育出版社, 1992
[3] Amerio L. Soluzioni quasi-periodiche, o limitate, di sistemi differenziali nonlineari quasi-periodici, o limitati. Ann Mat Pura Appl, 1955, 34: 97--119
[4] Cieutat P. Almost periodic solutions of forced vectorial Liénard equations. J differential Equations, 2005, 209: 302--328
[5] Campos J, Torres P J. On the structure of the set of bounded solutions on a periodic Liénard equation. Proc Amer Math Soc, 1999, 127: 1453--1462
[6] Corduneanu C. Almost Periodic Functions. New York: Chelsea, 1989
[7] Fink A M. Almost Periodic Differential Functions. Lecture Notes in Mathematics, Vol 377. Berlin, New York: Springer, 1974
[8] 姜东平, 何崇佑. 一类二阶非线性微分方程组的概周期解. 南京大学学报(自然科学版), 1981, 4: 419--431
[9] 林发兴. Li\'{e}nard 方程周期解, 概周期解的存在性. 数学学报, 1996, 39(3): 314--318
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