no. 2
The structure of Gauss-like maps
Compositio Mathematica, Tome 52 (1984) no. 2, pp. 171-177. 
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     author = {Ran, Ziv},
     title = {The structure of {Gauss-like} maps},
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     pages = {171--177},
     publisher = {Martinus Nijhoff Publishers},
     volume = {52},
     number = {2},
     year = {1984},
     mrnumber = {750353},
     zbl = {0547.14004},
     language = {en},
     url = {http://www.numdam.org/item/CM_1984__52_2_171_0/}
}
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Ran, Ziv. The structure of Gauss-like maps. Compositio Mathematica, Tome 52 (1984) no. 2, pp. 171-177. http://www.numdam.org/item/CM_1984__52_2_171_0/

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