@article{DAN_1971_198_1_a9,
     author = {A. V. Pogorelov},
     title = {An example of a twodimensional {Riemannian} metric admitting no local realization in $\mathrm{E}_3$},
     journal = {Doklady Akademii Nauk},
     pages = {42--43},
     publisher = {mathdoc},
     volume = {198},
     number = {1},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_198_1_a9/}
}