Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1989_25_7_a5, author = {Yu. V. Pokornyi and O. M. Penkin}, title = {Comparison theorems for equations on graphs}, journal = {Differencialʹnye uravneni\^a}, pages = {1141--1150}, publisher = {mathdoc}, volume = {25}, number = {7}, year = {1989}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1989_25_7_a5/} }
Yu. V. Pokornyi; O. M. Penkin. Comparison theorems for equations on graphs. Differencialʹnye uravneniâ, Tome 25 (1989) no. 7, pp. 1141-1150. http://geodesic.mathdoc.fr/item/DE_1989_25_7_a5/