@article{DE_1966_2_3_a11,
     author = {V. F. Butuzov},
     title = {On the question of the asymptotics of solutions to integro-differential equations with a small parameter in front of the derivative},
     journal = {Differencialʹnye uravneni\^a},
     pages = {391--406},
     publisher = {mathdoc},
     volume = {2},
     number = {3},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1966_2_3_a11/}
}