ALLSTON J.L.; GRANNELL M.J.; GRIGGS T.S.; STANTON R.G. Pairwise balanced designs on 4s+1 points with longest block of cardinality 2s. Utilitas Mathematica , [S. l.], v. 58, 2000. Disponível em: https://utilitasmathematica.com/index.php/Index/article/view/175. Acesso em: 8 may. 2026.