@article{MZM_2006_80_1_a10,
     author = {V. M. Savchin and S. A. Budochkina},
     title = {On the {Existence} of a {Variational} {Principle
}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {87--94},
     publisher = {mathdoc},
     volume = {80},
     number = {1},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2006_80_1_a10/}
}