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Translated from Zapiski Nauchnykh Seminarov Leningradskogo Otdeleniya Matematicheskogo Instituta im. Vol. 38, pp. 33–45, 1973.
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Il'in, E.M. Singularities of weak solutions of elliptic boundary-value problems with discontinuous leading coefficients. J Math Sci 8, 373–384 (1977). https://doi.org/10.1007/BF01084610
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DOI: https://doi.org/10.1007/BF01084610