@article{1138844728,
author = {Iwano, Masahiro and Sibuya, Yasutaka},
title = {Reduction of the order of a linear ordinary differential equation containing a small parameter},
journal = {Kodai Math. Sem. Rep.},
volume = {15},
number = {1},
year = {1963},
pages = { 1-28},
language = {en},
url = {http://dml.mathdoc.fr/item/1138844728}
}
Iwano, Masahiro; Sibuya, Yasutaka. Reduction of the order of a linear ordinary differential equation containing a small parameter. Kodai Math. Sem. Rep., Tome 15 (1963) no. 1, pp. 1-28. http://gdmltest.u-ga.fr/item/1138844728/