no. 1
Non-commutative Gauss map
Compositio Mathematica, Tome 83 (1992) no. 1, pp. 53-68. 
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     author = {Reznikov, A. G.},
     title = {Non-commutative {Gauss} map},
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     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/}
}
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Reznikov, A. G. Non-commutative Gauss map. Compositio Mathematica, Tome 83 (1992) no. 1, pp. 53-68. http://www.numdam.org/item/CM_1992__83_1_53_0/

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