@article{DAN_1957_113_6_a9,
     author = {A. I. Fet},
     title = {Absolute minimum in a two-dimensional parametric problem on a manifold},
     journal = {Doklady Akademii Nauk},
     pages = {1224--1226},
     publisher = {mathdoc},
     volume = {113},
     number = {6},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_113_6_a9/}
}