Literature cited
N. A. Shananin, “Local solvability of equations of the quasimain type,” Mat. Sb.,97, 503–516 (1975).
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Translated from Matematicheskie Zametki, Vol. 51, No. 6, pp. 115–125, June, 1992.
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Shananin, N.A. Weighing of derivatives. Math Notes 51, 604–611 (1992). https://doi.org/10.1007/BF01263307
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DOI: https://doi.org/10.1007/BF01263307