%0 Journal Article %A M. V. Babich %T Real finite-gap solutions of equations connected with the sine-Gordon equation %J Algebra i analiz %D 1990 %P 63-77 %V 2 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/AA_1990_2_3_a1/ %G ru %F AA_1990_2_3_a1