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KIGURADZE, Ivan a Bedřich PŮŽA. On Two-point Boundary Value Problems for Second Order Singular Functional Differential Equations. Functional Differential Equations. Israel: The College of Judea and Samaria, 2005, roč. 12/2005, 3-4, s. 271-294. ISSN 0793-1786.Podrobněji: https://is.muni.cz/publication/574404/cs