A. MURUGESAN; K. SHANMUGAVALLI. Oscillation conditions for first order neutral difference equations with positive and negative variable co-efficients. Malaya Journal of Matematik, India, v. 5, n. 02, p. 378–388, 2017. DOI: 10.26637/mjm502/015. Disponível em: https://www.malayajournal.org/index.php/mjm/article/view/602. Acesso em: 16 jul. 2024.