%0 Journal Article
%T A PROPERTY OF MULTI-DIMEN-SIONAL FUNCTION IN DISKS<br>A SUFFICIENT CONDITION FOR THE EXISTENCE OF LIMIT CYCLES OF CLASS (Ⅱ) OF QUADRATIC SYSTEMS
%J 科学通报(英文版)
%D 1983
%I 
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=01BA20E8BA813E1908F3698710BBFEFEE816345F465FEBA5&cid=96E6E851B5104576C2DD9FC1FBCB69EF&jid=DD6615BC9D2CFCE0B6F945E8D5314523&aid=7412246D8F82C22529558C94780004C2&yid=A7F20A391020FDEE&vid=D3E34374A0D77D7F&iid=5D311CA918CA9A03&sid=BAEC9CADFE1F0CCC&eid=BAEC9CADFE1F0CCC&journal_id=1001-6538&journal_name=科学通报(英文版)&referenced_num=0&reference_num=0