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Diff	Differential equations and their applications [Текст] : Proceedings of the Conference held in Bratislava in September 1966; equadiff. 2; Publ. in the journal "Acta facultatisrerum naturalium universitatis Comenianas"; Mathematica; publ. 17. — Bratislava : Slov. pedagog. nakl., 1967. — 322 p.