@article{1250130384,
author = {Etgen, G.J. and Taylor, W.E.},
title = {On the oscillation of a class of fourth order differential equations},
journal = {Rocky Mountain J. Math.},
volume = {6},
number = {4},
year = {1976},
pages = { 71-84},
language = {en},
url = {http://dml.mathdoc.fr/item/1250130384}
}
Etgen, G.J.; Taylor, W.E. On the oscillation of a class of fourth order differential equations. Rocky Mountain J. Math., Tome 6 (1976) no. 4, pp. 71-84. http://gdmltest.u-ga.fr/item/1250130384/