Boyvalenkov, Peter, and Maya Stoyanova. “SPHERICAL 2-DISTANCE SETS WHICH ARE SPHERICAL 3-DESIGNS”. Ann. Sofia Univ. Fac. Math. and Inf. 95 (December 12, 2003): 53–58. Accessed November 21, 2024. https://stipendii.uni-sofia.bg/index.php/fmi/article/view/175.