Colbourn, Charles J., and Bingli Fan. “ Locating One Pairwise Interaction: Three Recursive Constructions”. Journal of Algebra Combinatorics Discrete Structures and Applications 3, no. 3 (September 15, 2016): 127–134. Accessed September 12, 2026. https://jacodesmath.com/index.php/jacodesmath/article/view/40.