@article{DE_1974_10_2_a4,
     author = {V. Ya. Derr and N. N. Yuberev},
     title = {Two-sided difference schemes for the {Sturm{\textendash}Liouville} problem},
     journal = {Differencialʹnye uravneni\^a},
     pages = {221--230},
     year = {1974},
     volume = {10},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1974_10_2_a4/}
}