@article{DE_1992_28_9_a24,
     author = {V. M. Filippov and A. N. Tischenko},
     title = {The direct variational method for operator equations $u^{(k)}+C^mu=f$, $k=1,2$; $m\in\mathbf N$},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1642--1643},
     publisher = {mathdoc},
     volume = {28},
     number = {9},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1992_28_9_a24/}
}