In this paper, we shall establish some new criteria for the oscillation of
functional differential equations of the form.
x((n))(t) + (-1)F-n (t, x(g(t)), d/dtx(h(t))) = 0
via comparing it with some other functional differential equations of the s
ame or lower order whose oscillatory behavior is known. (C) 1999 Elsevier S
cience Ltd. All rights reserved.