@article{DE_1977_13_8_a9,
     author = {V. M. Filippov and A. N. Skorokhodov},
     title = {The principle of a minimum of a quadratic functional for a boundary value problem of heat conduction},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1434--1445},
     publisher = {mathdoc},
     volume = {13},
     number = {8},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_8_a9/}
}