KHACHATURYAN, A. . Optimal Permissible Placement by the Height of the Transitive Directed Tree with One Root. Mathematical Problems of Computer Science, [S. l.], v. 37, p. 88–95, 2021. Disponível em: http://mpcs.sci.am/index.php/mpcs/article/view/257. Acesso em: 26 apr. 2024.