@article{10_1017_S0017089502010066,
     author = {Zhu, Xuding},
     title = {The fractional chromatic number of the direct product of graphs},
     journal = {Glasgow mathematical journal},
     pages = {103--115},
     year = {2002},
     volume = {44},
     number = {1},
     doi = {10.1017/S0017089502010066},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089502010066/}
}