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@article{IM2_1974_8_6_a10, author = {I. L. Vulis and M. Z. Solomyak}, title = {Spectral asymptotics of second-order degenerate elliptic operators}, journal = {Izvestiya. Mathematics }, pages = {1343--1371}, publisher = {mathdoc}, volume = {8}, number = {6}, year = {1974}, language = {en}, url = {http://geodesic.mathdoc.fr/item/IM2_1974_8_6_a10/} }
I. L. Vulis; M. Z. Solomyak. Spectral asymptotics of second-order degenerate elliptic operators. Izvestiya. Mathematics , Tome 8 (1974) no. 6, pp. 1343-1371. http://geodesic.mathdoc.fr/item/IM2_1974_8_6_a10/