A. Murugesan, and K. Shanmugavalli. “Oscillation Conditions for First Order Neutral Difference Equations With Positive and Negative Variable Co-Efficients”. Malaya Journal of Matematik 5, no. 02 (April 1, 2017): 378–388. Accessed July 16, 2024. https://www.malayajournal.org/index.php/mjm/article/view/602.