@article{DE_1994_30_1_a4,
     author = {I. G. Karelina and Yu. V. Pokornyi},
     title = {On the {Green} function for a boundary value problem on a graph},
     journal = {Differencialʹnye uravneni\^a},
     pages = {41--47},
     publisher = {mathdoc},
     volume = {30},
     number = {1},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1994_30_1_a4/}
}