John Wanyoike, and Guangzhou Chen. “Construction of Two Factor Asymmetrical Factorial Designs That Are Characterized by Balance With Orthogonal Factorial Structure (BAFDs)”. International Journal of Mathematics And its Applications 13, no. 1 (March 22, 2025): 65–92. Accessed July 7, 2025. http://ijmaa.in/index.php/ijmaa/article/view/1503.