DIBLÍK, Josef a Jiří VÍTOVEC. Lower and upper estimates of solutions to systems of delay dynamic equations on time scales. Springer, 2013, 2013(1), 1-14. DOI: 10.1186/1687-2770-2013-260. ISSN 1687-2770. Dostupné také z: http://hdl.handle.net/11012/184119
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