@article{DE_2006_42_2_a15,
     author = {A. Ya. Lepin and V. D. Ponomarev},
     title = {On a positive solution of a three-point boundary value problem},
     journal = {Differencialʹnye uravneni\^a},
     pages = {272--274},
     publisher = {mathdoc},
     volume = {42},
     number = {2},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2006_42_2_a15/}
}