GYIMESI, ESZTER; NYUL, GABOR. A note on combinatorial subspaces and r-Stirling numbers. Utilitas Mathematica , [S. l.], v. 105, 2017. Disponível em: https://utilitasmathematica.com/index.php/Index/article/view/1176. Acesso em: 1 may. 2026.