%0 Journal Article %A A. I. Kozhanov %T Ultraparabolic equations with operator coefficients at the time derivatives %J The Bulletin of Irkutsk State University. Series Mathematics %D 2019 %P 120-137 %V 29 %U http://geodesic.mathdoc.fr/item/IIGUM_2019_29_a10/ %G en %F IIGUM_2019_29_a10