@article{UZERU_2009_2_a7,
     author = {S. Y. Markosyan and A. H. Khachaturyan},
     title = {Optimal level placement of the transitive oriented and bipartite oriented graphs by height},
     journal = {Proceedings of the Yerevan State University. Physical and mathematical sciences},
     pages = {43--46},
     publisher = {mathdoc},
     number = {2},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/UZERU_2009_2_a7/}
}