@article{SM_1989_62_1_a7,
     author = {D. V. Tunitsky},
     title = {On the regular isometric immersion in $E^3$ of unbounded domains of
},
     journal = {Sbornik. Mathematics},
     pages = {121--138},
     publisher = {mathdoc},
     volume = {62},
     number = {1},
     year = {1989},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1989_62_1_a7/}
}