@article{DE_2001_37_11_a1,
     author = {N. A. Bobylev and S. V. Emel'yanov and S. K. Korovin},
     title = {An {Approach} to {Variational} {Problems}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1453--1461},
     publisher = {mathdoc},
     volume = {37},
     number = {11},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2001_37_11_a1/}
}