TY - JOUR AU - M. I. Zelikin TI - Geometry of operator cross ratio JO - Sbornik. Mathematics PY - 2006 SP - 37 EP - 51 VL - 197 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/SM_2006_197_1_a2/ LA - en ID - SM_2006_197_1_a2 ER -