@article{DE_2004_40_3_a1,
     author = {A. I. Vagabov},
     title = {Regularity {Conditions} for a {Pencil} of {General} {Ordinary} {Differential} {Operators}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {299--309},
     publisher = {mathdoc},
     volume = {40},
     number = {3},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2004_40_3_a1/}
}