@article{03891798, title = {Nonoscillation theorems for functional differential equations of arbitrary order.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {7}, year = {1984}, pages = {249-256}, doi = {10.1155/S0161171284000259}, zbl = {0559.34068}, language = {en}, url = {http://dml.mathdoc.fr/item/03891798} }
Graef, John R.; Grammatikopoulos, Myron K.; Kitamura, Yuichi; Kusano, Takaŝi; Onose, Hiroshi; Spikes, Paul W. Nonoscillation theorems for functional differential equations of arbitrary order.. International Journal of Mathematics and Mathematical Sciences, Tome 7 (1984) pp. 249-256. doi : 10.1155/S0161171284000259. http://gdmltest.u-ga.fr/item/03891798/