@article{DE_2004_40_3_a3,
     author = {Yu. A. Klokov},
     title = {On the {Extremals} of a {Functional} on the {Plane}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {324--329},
     year = {2004},
     volume = {40},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2004_40_3_a3/}
}