Total curvature and the topology of complete surfaces
Compositio Mathematica, Tome 41 (1980) no. 1, pp. 95-105. 
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     author = {Bangert, Victor},
     title = {Total curvature and the topology of complete surfaces},
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     pages = {95--105},
     publisher = {Sijthoff et Noordhoff International Publishers},
     volume = {41},
     number = {1},
     year = {1980},
     mrnumber = {578052},
     zbl = {0403.53023},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1980__41_1_95_0/}
}
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Bangert, Victor. Total curvature and the topology of complete surfaces. Compositio Mathematica, Tome 41 (1980) no. 1, pp. 95-105. http://archive.numdam.org/item/CM_1980__41_1_95_0/

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