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Additional information
M. V. Lomonosov Moscow State University. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 24, No. 2, pp. 26–55, March–April, 1983.
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Kamynin, L.I., Khimchenko, B.N. Anisotropic strict extremum principle for second-order elliptic-parabolic equations. Sib Math J 24, 173–198 (1983). https://doi.org/10.1007/BF00968735
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DOI: https://doi.org/10.1007/BF00968735