@article{IVM_1994_6_a4,
     author = {A. A. Gruzdev and S. A. Gusarenko},
     title = {On the reduction of variational problems to extremal problems without constraints},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {39--49},
     publisher = {mathdoc},
     number = {6},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1994_6_a4/}
}