Geodesic
Isometric imbedding in $E^3$ of noncompact domains of nonpositive curvature
Matematičeskie zametki, Tome 25 (1979) no. 5, pp. 785-797 
E. V. Shikin. Isometric imbedding in $E^3$ of noncompact domains of nonpositive curvature. Matematičeskie zametki, Tome 25 (1979) no. 5, pp. 785-797. http://geodesic.mathdoc.fr/item/MZM_1979_25_5_a14/
@article{MZM_1979_25_5_a14,
     author = {E. V. Shikin},
     title = {Isometric imbedding in $E^3$ of noncompact domains of nonpositive curvature},
     journal = {Matemati\v{c}eskie zametki},
     pages = {785--797},
     year = {1979},
     volume = {25},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1979_25_5_a14/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

Author's abstract of a dissertation for the degree of Doctor of Physicomathematical Sciences. The dissertation was defended on Oct. 21, 1977, at a session of the Specialized Council D 002.38.02 at the V. A. Steklov Mathematics Institute of the Academy of Sciences of the USSR. Official opponents: Academician of the Academy of Sciences of the USSR, Doctor of Physicomathematical Sciences A. V. Pogorelov; Professor, Doctor of Physicomathematical Sciences É. G. Poznyak; Professor, Doctor of Physicomathematical Sciences A. S. Fedenko.