@article{UZERU_1987_3_a1,
     author = {S. Y. Markosyan and G. S. Gasparian},
     title = {$\omega$-perfect graphs},
     journal = {Proceedings of the Yerevan State University. Physical and mathematical sciences},
     pages = {9--15},
     publisher = {mathdoc},
     number = {3},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZERU_1987_3_a1/}
}