IKPAN, Okim; NWOBI, Felix. Variance exchange process: overcoming the problem of singular information matrices in quadratic three−variable response designs. Journal of Innovative Applied Mathematics and Computational Sciences, [S. l.], v. 4, n. 2, p. 175–187, 2024. DOI: 10.58205/jiamcs.v4i2.1847. Disponível em: https://jiamcs.centre-univ-mila.dz/index.php/jiamcs/article/view/v4i2_1847. Acesso em: 5 jan. 2025.