%0 Journal Article %A S. M. Natanzon %T Discrete subgroups of $GL(2,C)$ and spinor bundles on Riemann and Klein surfaces %J Funkcionalʹnyj analiz i ego priloženiâ %D 1991 %P 76-78 %V 25 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/FAA_1991_25_4_a11/ %G ru %F FAA_1991_25_4_a11