MUKHIGULASHVILI, Sulkhan a Bedřich PŮŽA. The focal boundary value problem for strongly singular higher-order nonlinear functional-differential equations. Springer Nature, 2015, 2015(17), 1-21. DOI: 10.1186/s13661-014-0277-1. ISSN 1687-2770. Dostupné také z: http://hdl.handle.net/11012/137373
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