%0 Journal Article %A G. D. Suvorov %A V. P. Luferenko %T Fourth Donets Colloquium on Quasi-Conformal Mapping Theory and Its Generalizations %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1975 %V 30 %N 3 %U http://geodesic.mathdoc.fr/item/RM_1975_30_3_a27/ %G ru %F RM_1975_30_3_a27