MANSTAVIČIUS, Eugenijus. On the frequency of multisets without some components. Lietuvos matematikos rinkinys, [S. l.], v. 40, n. spec., p. 55–60, 2000. DOI: 10.15388/LMR.2000.35051. Disponível em: https://journals.vu.lt./LMR/article/view/35051. Acesso em: 19 apr. 2025.