@article{DAN_1993_331_5_a3,
     author = {V. A. Gurvich},
     title = {Biseparated graphs are perfect},
     journal = {Doklady Akademii Nauk},
     pages = {541--545},
     publisher = {mathdoc},
     volume = {331},
     number = {5},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1993_331_5_a3/}
}