@article{1250131890,
author = {Willett, D.},
title = {A necessary and sufficient condition for the oscillation of some linear second order differential equations},
journal = {Rocky Mountain J. Math.},
volume = {1},
number = {4},
year = {1971},
pages = { 357-366},
language = {en},
url = {http://dml.mathdoc.fr/item/1250131890}
}
Willett, D. A necessary and sufficient condition for the oscillation of some linear second order differential equations. Rocky Mountain J. Math., Tome 1 (1971) no. 4, pp. 357-366. http://gdmltest.u-ga.fr/item/1250131890/