LI, W.-T.; CHENG, S.-S. AN OSCILLATiON THEOREM FOR A NEUTRAL DIFFERENCE EQUATION WITH POSITIVE AND NEGATIVE COEFFICIENTS. Tamkang Journal of Mathematics, [S. l.], v. 30, n. 1, p. 39–46, 1999. DOI: 10.5556/j.tkjm.30.1999.4204. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4204. Acesso em: 6 may. 2024.