@article{TM_1990_192_a7,
     author = {L. D. Kudryavtsev},
     title = {Variational problems with a~different number of boundary conditions},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {85--104},
     publisher = {mathdoc},
     volume = {192},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1990_192_a7/}
}