Oscillation Theorems for nth-Order Functional Differential Equations
Journal of Mathematical Analysis and Applications
Two oscillation theorems for even-order equations x (n) (t) + p(t)ƒ(x(t), x(h(t))) = 0
are established. These results are the extensions of those reported by Hamedani for the second-order equation x″(t) + p(t) ƒ(x(t), x(h(t))) = 0
Hamedani, Gholamhossein G. and Krenz, Gary S., "Oscillation Theorems for nth-Order Functional Differential Equations" (1989). Mathematics, Statistics and Computer Science Faculty Research and Publications. 603.