@article{1102706158,
author = {Gingold, H.},
title = {On the location of zeroes of oscillatory solutions of $y^{(n)}=c(x)y$.},
journal = {Pacific J. Math.},
volume = {120},
number = {2},
year = {1985},
pages = { 317-336},
language = {en},
url = {http://dml.mathdoc.fr/item/1102706158}
}
Gingold, H. On the location of zeroes of oscillatory solutions of $y^{(n)}=c(x)y$.. Pacific J. Math., Tome 120 (1985) no. 2, pp. 317-336. http://gdmltest.u-ga.fr/item/1102706158/