YOUSIF, D. A. Effect of physical factors in the causal relationship. Academic Journal of Nawroz University, [S. l.], v. 7, n. 1, p. 82–91, 2018. DOI: 10.25007/ajnu.v7n1a163. Disponível em: https://journals.nawroz.edu.krd/index.php/ajnu/article/view/163. Acesso em: 27 apr. 2024.