@article{ZNSL_2014_426_a2,
     author = {M. I. Belishev and A. V. Ivanov},
     title = {On a~calculus of variations problem},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {12--22},
     publisher = {mathdoc},
     volume = {426},
     year = {2014},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2014_426_a2/}
}