@article{CM_1992__83_1_53_0,
     author = {Reznikov, A. G.},
     title = {Non-commutative {Gauss} map},
     journal = {Compositio Mathematica},
     pages = {53--68},
     publisher = {Kluwer Academic Publishers},
     volume = {83},
     number = {1},
     year = {1992},
     mrnumber = {1168123},
     zbl = {0772.53037},
     language = {en},
     url = {http://www.numdam.org/item/CM_1992__83_1_53_0/}
}