@article{ZNSL_2011_391_a2,
     author = {S. L. Berlov and I. I. Bogdanov},
     title = {On graphs with a~large chromatic number containing no small odd cycles},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {35--44},
     publisher = {mathdoc},
     volume = {391},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2011_391_a2/}
}