@article{IVM_1964_1_a20,
     author = {D. E. Chernyi},
     title = {Geometry of the {Lagrange} variational problem with a double integral in $X_4$},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {153--165},
     publisher = {mathdoc},
     number = {1},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1964_1_a20/}
}