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DOŠLÁ, Zuzana a Ivan KIGURADZE. On boundedness and stability of solutions of second order linear differential equaitons with advanced arguments. Advances in Mathematical Sciences and Applications. Tokyo: Gakkotosho, 1999, roč. 9, č. 1, s. 1-24. ISSN 1343-4373.Podrobněji: https://is.muni.cz/publication/345994/cs