MANSTAVIČIUS, Eugenijus. On analytic problems of combinatorial structures. Lietuvos matematikos rinkinys, [S. l.], v. 39, n. III, p. 75–80 , 1999. DOI: 10.15388/LMR.1999.35482. Disponível em: https://journals.vu.lt./LMR/article/view/35482. Acesso em: 19 apr. 2025.