Moya-Moya, Luz Marina, and Milton Januario Rueda-Varón. “Obtainment of the Variance-Covariance Matrix through Kronecker Products for Balanced Models of Two and Three Ways With Applications in R”. Universitas Scientiarum 16, no. 3 (November 1, 2011): 263–271. Accessed February 5, 2023. https://revistas.javeriana.edu.co/index.php/scientarium/article/view/1790.