JAMIL, M. S.; MOHAMAD JAPERI, A. Z. U.-S.; ABU BAKAR, A. A.; MUHAMMAD ALI, K. A.; AHMAT, H. Identification of Source Contributions to Air Pollution in Penang Using Factor Analysis. International Journal of Integrated Engineering, [S. l.], v. 11, n. 8, p. 221–228, 2019. Disponível em: https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/2472. Acesso em: 3 jul. 2022.