CENTER-FOCUS PROBLEM FOR ANALYTIC SYSTEMS WITH NULL LINEAR PARTS .1.

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作者：

SADOVSKII, AP

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来源：

DIFFERENTIAL EQUATIONS | 1989年 / 25卷 / 05期

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O1 [数学];

学科分类号：

0701 ; 070101 ;

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页码：552 / 560

页数：9

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