Ss. Cheng et Yz. Lin, COMPLETE CHARACTERIZATIONS OF AN OSCILLATORY NEUTRAL DIFFERENCE EQUATION, Journal of mathematical analysis and applications, 221(1), 1998, pp. 73-91
This paper is concerned with a basic neutral type difference equation
which depends on four parameters. By means of the theory of envelopes,
we determine the exact range of the parameters for which the correspo
nding equation is oscillatory. (C) 1998 Academic Press.