@article{3147,
author = {Eastham, M.S.P.},
title = {The asymptotic solution of higher-order differential equations with small final coefficient},
journal = {Portugaliae mathematica},
volume = {45},
year = {1988},
pages = {351-362},
zbl = {0676.34036},
mrnumber = {0982904},
language = {en},
url = {http://dml.mathdoc.fr/item/3147}
}
Eastham, M.S.P. The asymptotic solution of higher-order differential equations with small final coefficient. Portugaliae mathematica, Tome 45 (1988) pp. 351-362. http://gdmltest.u-ga.fr/item/3147/