@article{2613,
author = {Al-Bassam, M.A.},
title = {On the existence of series solution of differential equations of generalized order},
journal = {Portugaliae mathematica},
volume = {29},
year = {1970},
pages = {5-11},
zbl = {0219.34009},
mrnumber = {0291526},
language = {en},
url = {http://dml.mathdoc.fr/item/2613}
}
Al-Bassam, M.A. On the existence of series solution of differential equations of generalized order. Portugaliae mathematica, Tome 29 (1970) pp. 5-11. http://gdmltest.u-ga.fr/item/2613/