On the extrinsic geometry of elementary complete surfaces with nonpositive curvature.~II
Sbornik. Mathematics, Tome 4 (1968) no. 1, pp. 99-123

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     author = {A. L. Verner},
     title = {On the extrinsic geometry of elementary complete surfaces with nonpositive {curvature.~II}},
     journal = {Sbornik. Mathematics},
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     volume = {4},
     number = {1},
     year = {1968},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1968_4_1_a6/}
}
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A. L. Verner. On the extrinsic geometry of elementary complete surfaces with nonpositive curvature.~II. Sbornik. Mathematics, Tome 4 (1968) no. 1, pp. 99-123. http://geodesic.mathdoc.fr/item/SM_1968_4_1_a6/