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Translated from Matematicheskie Zametki, Vol. 49, No. 5, pp. 142–148, May, 1991.
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Yudovich, V.I. Cosymmetry, degeneration of solutions of operator equations, and onset of a filtration convection. Mathematical Notes of the Academy of Sciences of the USSR 49, 540–545 (1991). https://doi.org/10.1007/BF01142654
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DOI: https://doi.org/10.1007/BF01142654