Geodesic
Estimation of bijective projection area of a surface with negative curvature
Vestnik Ûžno-Uralʹskogo gosudarstvennogo universiteta. Seriâ, Matematika, mehanika, fizika, Tome 5 (2013) no. 1, pp. 4-7

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The article deals with a surface of negative Gaussian curvature which is bijectively projected onto a circle. It provides sufficient conditions of existence of an estimate for the circle radius.
Keywords: surfaces with negative Gaussian curvature, hyperbolic Monge–Ampere equation, esti­mation of bijective projection area. 
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     author = {D. G. Azov},
     title = {Estimation of bijective projection area of a surface with negative curvature},
     journal = {Vestnik \^U\v{z}no-Uralʹskogo gosudarstvennogo universiteta. Seri\^a, Matematika, mehanika, fizika},
     pages = {4--7},
     publisher = {mathdoc},
     volume = {5},
     number = {1},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VYURM_2013_5_1_a0/}
}
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D. G. Azov. Estimation of bijective projection area of a surface with negative curvature. Vestnik Ûžno-Uralʹskogo gosudarstvennogo universiteta. Seriâ, Matematika, mehanika, fizika, Tome 5 (2013) no. 1, pp. 4-7. http://geodesic.mathdoc.fr/item/VYURM_2013_5_1_a0/