@article{GDZPPN002184591,
title = {A reduction theorem for divergent power series.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {244},
year = {1970},
pages = {27-33},
zbl = {0191.04403},
url = {http://dml.mathdoc.fr/item/GDZPPN002184591}
}
Abhyankar, S.S.; Moh, T.T. A reduction theorem for divergent power series.. Journal für die reine und angewandte Mathematik, Tome 244 (1970) pp. 27-33. http://gdmltest.u-ga.fr/item/GDZPPN002184591/