%0 Journal Article %A A. S. Demyshev %A V. I. Rodionov %T On equivalent definition of continuous differentiability %J Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta %D 2006 %P 39-42 %N 2 %U http://geodesic.mathdoc.fr/item/IIMI_2006_2_a8/ %G ru %F IIMI_2006_2_a8