Mwesigwa, R., Sarvate, D. G. and Zhang, L. (2016) “Group divisible designs of four groups and block size five with configuration (1; 1; 1; 2)”, Journal of Algebra Combinatorics Discrete Structures and Applications, 3(3), pp. 187–194. Available at: https://jacodesmath.com/index.php/jacodesmath/article/view/47 (Accessed: 12 September 2026).