Surfaces of negative curvature
Itogi Nauki i Tekhniki. Seriya Algebra. Geometriya. Topologiya , Tome 12 (1974), pp. 171-207.

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     author = {\`E. G. Poznyak and E. V. Shikin},
     title = {Surfaces of negative curvature},
     journal = {Itogi Nauki i Tekhniki. Seriya Algebra. Geometriya. Topologiya },
     pages = {171--207},
     publisher = {mathdoc},
     volume = {12},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTA_1974_12_a3/}
}
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È. G. Poznyak; E. V. Shikin. Surfaces of negative curvature. Itogi Nauki i Tekhniki. Seriya Algebra. Geometriya. Topologiya , Tome 12 (1974), pp. 171-207. http://geodesic.mathdoc.fr/item/INTA_1974_12_a3/