by Konstantin Sergeevich Sibirskiĭ, Institutul de Matematikė ku Chentru de Kalkul (Akademii︠a︡ de Shtiint︠s︡e a RSSM), Vsesoi︠u︡znai︠a︡ konferent︠s︡ii︠a︡ po kachestvennoĭ teorii different︠s︡ialʹnykh uravneniĭ (5th 1979)
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