@article{DAN_1988_298_5_a5,
     author = {L. D. Kudryavtsev},
     title = {Existence and uniqueness of solutions of variational problems},
     journal = {Doklady Akademii Nauk},
     pages = {1055--1060},
     publisher = {mathdoc},
     volume = {298},
     number = {5},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1988_298_5_a5/}
}