THANDAPANI, E., and R. ARUL. “OSCILLATION THEORY FOR A CLASS OF SECOND ORDER QUASILINEAR DIFFERENCE EQUATIONS”. Tamkang Journal of Mathematics 28, no. 3 (September 1, 1997): 229–238. Accessed April 24, 2024. https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4319.