OYEDELE, O.; GARDNER-LUBBE, S. The covariance biplot to reveal relationships between different sets of variables. International Science and Technology Journal of Namibia, [S. l.], p. 107–113, 2014. Disponível em: https://journals.unam.edu.na/index.php/ISTJN/article/view/1131. Acesso em: 19 may. 2024.