@misc{Armen_Khachaturyan_The,
 author={Armen Khachaturyan},
 howpublished={online},
 publisher={Изд-во НАН РА},
 title={The optimal permissible placement by the height of the transitive oriented tree containing one vertex of branching},
 type={Հոդված},
 keywords={Mathematics, Graph theory},
}