%0 Journal Article %A È. R. Rozendorn %T A~sufficient condition for global regularity of nets of curves in the Euclidean plane %J Sbornik. Mathematics %D 1975 %P 111-127 %V 25 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1975_25_1_a6/ %G en %F SM_1975_25_1_a6