%0 Journal Article %A Reznikov, A. G. %T Non-commutative Gauss map %J Compositio Mathematica %D 1992 %P 53-68 %V 83 %N 1 %I Kluwer Academic Publishers %U http://archive.numdam.org/item/CM_1992__83_1_53_0/ %G en %F CM_1992__83_1_53_0