%0 Journal Article %A A. M. Shelekhov %T A generalized theorem on curvilinear three-web boundaries and its applications %J Sbornik. Mathematics %D 2020 %P 422-454 %V 211 %N 3 %U http://geodesic.mathdoc.fr/item/SM_2020_211_3_a3/ %G en %F SM_2020_211_3_a3