BURGER A.P.; GRÜNDLINGH W.R.; VAN VUUREN J.H. Two combinatorial problems involving lottery schemes: Algorithmic determination of solution sets. Utilitas Mathematica , [S. l.], v. 70, 2006. Disponível em: https://utilitasmathematica.com/index.php/Index/article/view/425. Acesso em: 8 may. 2026.