@article{DE_1987_23_11_a7,
     author = {L. Yu. Motylev},
     title = {Perturbation theory in a complex domain for equations of {Turritin} type with a small parameter multiplying the derivative},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1904--1913},
     publisher = {mathdoc},
     volume = {23},
     number = {11},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_11_a7/}
}