О -гипоэллиптических уравнениях
В.В. Грушин (1962)
Matematiceskij sbornik
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В.В. Грушин (1962)
Matematiceskij sbornik
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Л.М. Шифнер ([unknown])
Matematiceskij sbornik
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А.Л. Трескунов (1967)
Zapiski naucnych seminarov Leningradskogo
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Д. Шин ([unknown])
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А.М. Кытманов (1991)
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А.Л. Якымив (1989)
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В.И. Янчевский (1979)
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Boris A. Efimov, G. I. Chertanov (1978)
Commentationes Mathematicae Universitatis Carolinae
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Ernest Jucovič (1962)
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В.А. Артамонов (1968)
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