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Translated from Zapiski Nauchnykh Seminarov Leningradskogo Otdeleniya Matematicheskogo Instituta im. V. A. Steklova AN SSSR, Vol. 38, pp. 7–9, 1973.
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Arkhipova, A.A. Smoothness of solutions of problems with an obstacle. J Math Sci 8, 351–353 (1977). https://doi.org/10.1007/BF01084608
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DOI: https://doi.org/10.1007/BF01084608