%0 Journal Article %A Yu. A. Aminov %T On the nonbendability of closed surfaces of trigonometric type %J Sbornik. Mathematics %D 1992 %P 549-560 %V 71 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1992_71_2_a17/ %G en %F SM_1992_71_2_a17