On the Symmetric Block Design with Parameters (306,61,12) Admitting a Group of Order 61. European Journal of Pure and Applied Mathematics, Maryland, USA, v. 11, n. 3, p. 645–651, 2018. DOI: 10.29020/nybg.ejpam.v11i3.3259. Disponível em: https://www.ejpam.com/index.php/ejpam/article/view/3259.. Acesso em: 27 may. 2024.