Moya-Moya, Luz Marina, and Milton Januario Rueda-Varón. 2011. “Obtainment of the Variance-Covariance Matrix through Kronecker Products for Balanced Models of Two and Three Ways With Applications in R”. Universitas Scientiarum 16 (3):263-71. https://doi.org/10.11144/javeriana.SC16-3.ootv.