@article{DAN_1986_290_3_a0,
     author = {Ya. I. Al'ber and A. I. Notik},
     title = {Minimization of functionals and the solution of variational},
     journal = {Doklady Akademii Nauk},
     pages = {521--526},
     publisher = {mathdoc},
     volume = {290},
     number = {3},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1986_290_3_a0/}
}