XIAODONG, XU; RADZISZOWSKI, STANISLAW P. 28≤R(C4,C4,C3,C3)≤36. Utilitas Mathematica , [S. l.], v. 79, 2009. Disponível em: https://utilitasmathematica.com/index.php/Index/article/view/609. Acesso em: 8 may. 2026.