Nemat NYAMORADI , Tsing-San HSU . EXISTENCE OF MULTIPLE POSITIVE SOLUTIONS FOR SEMILINEAR ELLIPTIC SYSTEMS INVOLVING m CRITICAL HARDY-SOBOLEV EXPONENTS AND m SIGN-CHANGING WEIGHT FUNCTION[J]. Acta mathematica scientia, Series B, 2014 , 34(2) : 483 -500 . DOI: 10.1016/S0252-9602(14)60022-9

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