Geodesic
On impossibility of $W_q^2$-estimates for the elliptic equations in several variables with discontinuous coefficients
Zapiski Nauchnykh Seminarov POMI, Boundary-value problems of mathematical physics and related problems of function theory. Part 1, Tome 5 (1967), pp. 250-254 
N. N. Ural'tseva. On impossibility of $W_q^2$-estimates for the elliptic equations in several variables with discontinuous coefficients. Zapiski Nauchnykh Seminarov POMI, Boundary-value problems of mathematical physics and related problems of function theory. Part 1, Tome 5 (1967), pp. 250-254. http://geodesic.mathdoc.fr/item/ZNSL_1967_5_a10/
@article{ZNSL_1967_5_a10,
     author = {N. N. Ural'tseva},
     title = {On impossibility of $W_q^2$-estimates for the elliptic equations in several variables with discontinuous coefficients},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {250--254},
     year = {1967},
     volume = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1967_5_a10/}
}
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AU  - N. N. Ural'tseva
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%U http://geodesic.mathdoc.fr/item/ZNSL_1967_5_a10/
%G ru
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