Khachaturyan, Armen. “The Optimal Permissible Placement by the Height of the Transitive Oriented Treecontaining One Vertex of Branching”. Mathematical Problems of Computer Science 33 (December 10, 2021): 183–186. Accessed May 2, 2025. http://www.mpcs.sci.am/index.php/mpcs/article/view/347.