Geodesic
Regular isometric immersion in the~large of two-dimensional metrics of nonpositive curvature
Sbornik. Mathematics, Tome 76 (1993) no. 2, pp. 317-329

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The author proves the possibility of a regular isometric immersion in three-dimensional Euclidean space of certain classes of unbounded domains on complete Riemannian manifolds of nonpositive curvature that are homeomorphic to the plane. This is an extension and development of the results of the author published in [1] and [2]. 
@article{SM_1993_76_2_a4,
     author = {D. V. Tunitsky},
     title = {Regular isometric immersion in the~large of two-dimensional metrics of nonpositive curvature},
     journal = {Sbornik. Mathematics},
     pages = {317--329},
     publisher = {mathdoc},
     volume = {76},
     number = {2},
     year = {1993},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1993_76_2_a4/}
}
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D. V. Tunitsky. Regular isometric immersion in the~large of two-dimensional metrics of nonpositive curvature. Sbornik. Mathematics, Tome 76 (1993) no. 2, pp. 317-329. http://geodesic.mathdoc.fr/item/SM_1993_76_2_a4/