Geodesic
Certain properties of surfaces of negative external curvature in Lobachevskian space
Matematičeskie zametki, Tome 4 (1968) no. 2, pp. 165-168.

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Several relationships are established bearing on the external curvature, $K_e$ of surfaces in three-dimensional Lobachevskian space $L_3$ ($K_e0$). 
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     author = {L. A. Sidorov},
     title = {Certain properties of surfaces of negative external curvature in {Lobachevskian} space},
     journal = {Matemati\v{c}eskie zametki},
     pages = {165--168},
     publisher = {mathdoc},
     volume = {4},
     number = {2},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1968_4_2_a6/}
}
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L. A. Sidorov. Certain properties of surfaces of negative external curvature in Lobachevskian space. Matematičeskie zametki, Tome 4 (1968) no. 2, pp. 165-168. http://geodesic.mathdoc.fr/item/MZM_1968_4_2_a6/