@article{IM2_1999_63_6_a4,
     author = {I. Kh. Sabitov},
     title = {Isometric immersions and embeddings of locally {Euclidean} metrics in~$\mathbb R^2$},
     journal = {Izvestiya. Mathematics},
     pages = {1203--1220},
     year = {1999},
     volume = {63},
     number = {6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1999_63_6_a4/}
}