@article{1250128657,
author = {Jim, W.J.},
title = {Disfocality and nonoscillatory solutions of nth order differential equations},
journal = {Rocky Mountain J. Math.},
volume = {11},
number = {4},
year = {1981},
pages = { 177-194},
language = {en},
url = {http://dml.mathdoc.fr/item/1250128657}
}
Jim, W.J. Disfocality and nonoscillatory solutions of nth order differential equations. Rocky Mountain J. Math., Tome 11 (1981) no. 4, pp. 177-194. http://gdmltest.u-ga.fr/item/1250128657/