AREEF, Ali. Correction for multicollinearity between the explanatory variables to estimation by using the Principal component method . University of Thi-Qar Journal of Science, University of Thi-Qar, Thi-Qar, Iraq, v. 2, n. 2, p. 145–151, 2010. Disponível em: https://jsci.utq.edu.iq/index.php/main/article/view/367.. Acesso em: 3 apr. 2025.