@article{DE_2001_37_1_a7,
     author = {E. G. D'yakonov},
     title = {Regular {Perturbations} of {Nonstationary} {Problems} of {Mathematical} {Physics} {Related} to {Linear} {Constraints:} {I}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {55--65},
     publisher = {mathdoc},
     volume = {37},
     number = {1},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2001_37_1_a7/}
}