Bg. Zhang et al., OSCILLATION FOR DIFFERENCE-EQUATIONS WITH CONTINUOUS VARIABLE, Computers & mathematics with applications (1987), 36(9), 1998, pp. 11-18
Consider the delay difference equation y(t) - y(t - tau) + p(t)H(Y(t -
sigma)) = f(t), t greater than or equal to 0 where tau > 0, sigma > 0
, and p is an element of C(R+, R+) f is an element of C(R+, R), H is a
n element of C(R, R). Some oscillation criteria for this equation are
obtained. (C) 1998 Elsevier Science Ltd. All rights reserved.