Tsing-San Hsu , Huei-Lin Li . MULTIPLICITY OF POSITIVE SOLUTIONS FOR SINGULAR ELLIPTIC SYSTEMS WITH CRITICAL SOBOLEV-HARDY AND CONCAVE EXPONENTS[J]. Acta mathematica scientia, Series B, 2011 , 31(3) : 791 -804 . DOI: 10.1016/S0252-9602(11)60276-2

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