Hua CHEN , Hongge CHEN , Yirui DUAN , Xin HU . LOWER BOUNDS OF DIRICHLET EIGENVALUES FOR A CLASS OF FINITELY DEGENERATE GRUSHIN TYPE ELLIPTIC OPERATORS[J]. Acta mathematica scientia, Series B, 2017 , 37(6) : 1653 -1664 . DOI: 10.1016/S0252-9602(17)30098-X

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