%0 Journal Article %A Yu. E. Alenitsyn %T Some extremal properties of conformal mappings of a~multiply connected domain onto canonical $p$-sheeted surfaces %J Matematičeskie zametki %D 1978 %P 261-270 %V 23 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZM_1978_23_2_a9/ %G ru %F MZM_1978_23_2_a9