%0 Journal Article %A V. T. Erofeenko %T Addition theorems and integral transformations on classes of harmonic functions %J Differencialʹnye uravneniâ %D 1983 %P 809-818 %V 19 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1983_19_5_a5/ %G ru %F DE_1983_19_5_a5