@article{DE_1993_29_12_a16,
     author = {O. Ya. Savchenko},
     title = {Two-sided estimates for the eigenvalues of the {Dirac} equation and its analogues},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2190--2192},
     publisher = {mathdoc},
     volume = {29},
     number = {12},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1993_29_12_a16/}
}