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Том 69
№ 9

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A necessary condition for the hypoellipticity of second-order equations with alternating characteristic form

Ha T'en Ngoan

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English version (Springer): Ukrainian Mathematical Journal 35 (1983), no. 3, pp 285-293.

Citation Example: Ha T'en Ngoan A necessary condition for the hypoellipticity of second-order equations with alternating characteristic form // Ukr. Mat. Zh. - 1983. - 35, № 3. - pp. 333 — 341.

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