@article{DE_1993_29_1_a9,
     author = {L. V. Kritskov},
     title = {Representation and estimates of root functions of singular differential operators on an interval. {II}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {64--73},
     publisher = {mathdoc},
     volume = {29},
     number = {1},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1993_29_1_a9/}
}