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Fundamental solution, eigenvalue asymptotics and eigenfunctions of degenerate elliptic operators with positive potentials
Studia Mathematica, Tome 138 (2000) no. 2, pp. 101-119

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We show a weighted version of Fefferman-Phong's inequality and apply it to give an estimate of fundamental solutions, eigenvalue asymptotics and exponential decay of eigenfunctions for certain degenerate elliptic operators of second order with positive potentials. 
Kazuhiro Kurata;  . Fundamental solution, eigenvalue asymptotics and eigenfunctions of degenerate elliptic operators with positive potentials. Studia Mathematica, Tome 138 (2000) no. 2, pp. 101-119. doi: 10.4064/sm-138-2-101-119
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