Geodesic
Singularities of weak solutions of elliptic equations with discontinuous coefficients. II. Angular points of lines of gap
Zapiski Nauchnykh Seminarov POMI, Investigations on linear operators and function theory. Part V, Tome 47 (1974), pp. 166-169
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For second order elliptic equations in plane bounded domains the asymptotics and estimates of the solutions in the neighbourhood of singular points are found. 
@article{ZNSL_1974_47_a12,
     author = {E. M. Il'in},
     title = {Singularities of weak solutions of elliptic equations with discontinuous coefficients. {II.~Angular} points of lines of gap},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {166--169},
     year = {1974},
     volume = {47},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1974_47_a12/}
}
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E. M. Il'in. Singularities of weak solutions of elliptic equations with discontinuous coefficients. II. Angular points of lines of gap. Zapiski Nauchnykh Seminarov POMI, Investigations on linear operators and function theory. Part V, Tome 47 (1974), pp. 166-169. http://geodesic.mathdoc.fr/item/ZNSL_1974_47_a12/