@article{IVM_1969_2_a5,
     author = {S. F. Morozov and V. V. Petrov},
     title = {A~certain $n$-dimensional nonregular problem of the calculus of variations},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {54--62},
     publisher = {mathdoc},
     number = {2},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1969_2_a5/}
}