@article{1250130638,
author = {Cooper, Wyatt G. and Hallman, Thomas G.},
title = {Nonlinear perturbation of a linear system of differential equations with a regular singular point},
journal = {Rocky Mountain J. Math.},
volume = {5},
number = {4},
year = {1975},
pages = { 247-254},
language = {en},
url = {http://dml.mathdoc.fr/item/1250130638}
}
Cooper, Wyatt G.; Hallman, Thomas G. Nonlinear perturbation of a linear system of differential equations with a regular singular point. Rocky Mountain J. Math., Tome 5 (1975) no. 4, pp. 247-254. http://gdmltest.u-ga.fr/item/1250130638/