@article{1077467927,
author = {Levinson, N.},
title = {A boundary value problem for a singularly perturbed
differential equation},
journal = {Duke Math. J.},
volume = {25},
number = {1},
year = {1958},
pages = { 331-342},
language = {en},
url = {http://dml.mathdoc.fr/item/1077467927}
}
Levinson, N. A boundary value problem for a singularly perturbed
differential equation. Duke Math. J., Tome 25 (1958) no. 1, pp. 331-342. http://gdmltest.u-ga.fr/item/1077467927/