%0 Journal Article %A I. E. Ovcharenko %T An application of the method of directional functionals in the theory of precommuting operators %J Doklady Akademii Nauk %D 1964 %P 1038-1041 %V 154 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1964_154_5_a8/ %G ru %F DAN_1964_154_5_a8