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Institute of Geology and Geophysics, Siberian Branch, Academy of Sciences of the USSR, Novosibirsk. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 23, No. 1, pp. 114–129, January–February, 1982.
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Nikol'skii, É.V. Theory of two-dimensional differential equations and systems of second order. Sib Math J 23, 89–101 (1982). https://doi.org/10.1007/BF00971424
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DOI: https://doi.org/10.1007/BF00971424