The Lyapunov stability of the Timoshenko type equation Jaroslav Barták (1976) Časopis pro pěstování matematiky
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Two point boundary value problems for operational differential equations H. O. Fattorini (1974) Annali della Scuola Normale Superiore di Pisa - Classe di Scienze
Tеоремы существования неотрицательных периодических решений конечных и счетных систем дифференциальных уравнений и теорема существования решений счетных систем дифференциальных уравнений Tokhtar Kemelbaevich Nurekenov (1974) Commentationes Mathematicae Universitatis Carolinae