Xueliang DUAN , Gongming WEI , Haitao YANG . POSITIVE SOLUTIONS AND INFINITELY MANY SOLUTIONS FOR A WEAKLY COUPLED SYSTEM[J]. Acta mathematica scientia, Series B, 2020 , 40(5) : 1585 -1601 . DOI: 10.1007/s10473-020-0523-9

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