@article{GDZPPN002536722,
title = {Approximate solutions of the operator linear differential equation I.},
journal = {Publications de l'Institut Math\'ematique [Elektronische Ressource]},
volume = {35},
year = {1977},
pages = {185-196},
zbl = {0352.44007},
language = {en},
url = {http://dml.mathdoc.fr/item/GDZPPN002536722}
}
Stankovic, B. Approximate solutions of the operator linear differential equation I.. Publications de l'Institut Mathématique [Elektronische Ressource], Tome 35 (1977) pp. 185-196. http://gdmltest.u-ga.fr/item/GDZPPN002536722/