Osifodunrin, Adegoke Solomon. “Existence of (v,k,2) Difference Sets With k<2030 and K-2 Is a Natural Number”. *International Journal of Mathematical Analysis and Optimization: Theory and Applications* 2019, no. 2 (October 17, 2019): 520 - 544. Accessed February 20, 2020. http://ihafa.unilag.edu.ng/index.php/ijmao/article/view/479.