CLAPPERTON, JAMES A.; LARCOMBE, PETER J.; FENNESSEY, ERIC J. On iterated generating functions: A class of impossible sequences. Utilitas Mathematica , [S. l.], v. 84, 2011. Disponível em: https://utilitasmathematica.com/index.php/Index/article/view/811. Acesso em: 8 may. 2026.