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@article{MMO_1973_28_a0, author = {M. \v{S}. Birman and M. Z. Solomyak}, title = {Spectral asymptotics of nonsmooth elliptic {operators.~I,~II}}, journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva}, pages = {3--34}, publisher = {mathdoc}, volume = {28}, year = {1973}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MMO_1973_28_a0/} }
M. Š. Birman; M. Z. Solomyak. Spectral asymptotics of nonsmooth elliptic operators.~I,~II. Trudy Moskovskogo matematičeskogo obŝestva, Trudy Moskovskogo Matematicheskogo Obshchestva, Tome 28 (1973), pp. 3-34. http://geodesic.mathdoc.fr/item/MMO_1973_28_a0/