%0 Journal Article
%T Periodic perturbation of planar systems with a semistable limit cycle<br>
%A Mao&#
%A an Han
%A <br>
%J 科学通报(英文版)
%D 1997
%I 
%K limit cycle
%K invariant torus
%K subharmonic solution<br>
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=01BA20E8BA813E1908F3698710BBFEFEE816345F465FEBA5&cid=96E6E851B5104576C2DD9FC1FBCB69EF&jid=DD6615BC9D2CFCE0B6F945E8D5314523&aid=48488DFF8FB80C1CD192CB467C03C0D9&yid=5370399DC954B911&vid=ECE8E54D6034F642&iid=E158A972A605785F&sid=FDC7AF55F77D8CD4&eid=FDC7AF55F77D8CD4&journal_id=1001-6538&journal_name=科学通报(英文版)&referenced_num=0&reference_num=5