KUMAR, M. P. Sharath; SURESH, P. R. Market Efficiency of Rubber: An Analytical Study Based on Co-integration Technique. International Journal of Bio-resource and Stress Management, [S. l.], v. 8, n. Aug, 4, p. 581–584, 2017. Disponível em: https://ojs.pphouse.org/index.php/IJBSM/article/view/1158. Acesso em: 21 sep. 2025.