@article{DE_2005_41_5_a13,
     author = {R. P. Agarwal and K. Perera and D. O'Regan},
     title = {Positive {Solutions} of {Higher-Order} {Singular} {Problems}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {702--705},
     publisher = {mathdoc},
     volume = {41},
     number = {5},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2005_41_5_a13/}
}