@article{1102868436,
author = {Grefsrud, Gary W.},
title = {Oscillatory properties of solutions of certain $n$th order functional differential equations.},
journal = {Pacific J. Math.},
volume = {61},
number = {2},
year = {1975},
pages = { 83-93},
language = {en},
url = {http://dml.mathdoc.fr/item/1102868436}
}
Grefsrud, Gary W. Oscillatory properties of solutions of certain $n$th order functional differential equations.. Pacific J. Math., Tome 61 (1975) no. 2, pp. 83-93. http://gdmltest.u-ga.fr/item/1102868436/