%0 Journal Article %A A. Ya. Khokhryakov %T On a certain theorem of N.\,E.~{\v Z}ukovski{\v\i} %J Differencialʹnye uravneniâ %D 1973 %P 1919-1921 %V 9 %N 10 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1973_9_10_a19/ %G ru %F DE_1973_9_10_a19