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References
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Vishik M. I., Trudy MMO, 1, 1952, 187–246   |
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Khermander L., K teorii obschikh differentsialnykh operatorov v chastnykh proizvodnykh, IL, M., 1959 |
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Ladyzhenskaya O. A., Uraltseva N. N., Lineinye i kvazilineinye uravneniya ellipticheskogo tipa, Nauka, M., 1973 |
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Gaevskii Kh., Greger K., Zakharias K., Nelineinye operatornye uravneniya i operatornye differentsialnye
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