%0 Journal Article %A S. Y. Markosyan %A A. H. Khachaturyan %T Optimal level placement of the transitive oriented and bipartite oriented graphs by height %J Proceedings of the Yerevan State University. Physical and mathematical sciences %D 2009 %P 43-46 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/UZERU_2009_2_a7/ %G en %F UZERU_2009_2_a7