Some examples of lexicographic order algorithms and some open combinatorial problems. Annual of Sofia University St. Kliment Ohridski. Faculty of Mathematics and Informatics, [S. l.], v. 89, p. 203–215, 1997. Disponível em: https://annual.uni-sofia.bg/index.php/fmi/article/view/369. Acesso em: 17 dec. 2025.