TY - JOUR AU - Reznikov, A. G. TI - Non-commutative Gauss map JO - Compositio Mathematica PY - 1992 SP - 53 EP - 68 VL - 83 IS - 1 PB - Kluwer Academic Publishers UR - http://www.numdam.org/item/CM_1992__83_1_53_0/ LA - en ID - CM_1992__83_1_53_0 ER -