@article{03953306,
title = {Generalized multitime expansions for equations with slowly varying coefficients.},
journal = {International Journal of Mathematics and Mathematical Sciences},
volume = {7},
year = {1984},
pages = {151-158},
doi = {10.1155/S0161171284000156},
zbl = {0593.34054},
language = {en},
url = {http://dml.mathdoc.fr/item/03953306}
}
Levine, L.E.; Obi, W.C. Generalized multitime expansions for equations with slowly varying coefficients.. International Journal of Mathematics and Mathematical Sciences, Tome 7 (1984) pp. 151-158. doi : 10.1155/S0161171284000156. http://gdmltest.u-ga.fr/item/03953306/