@article {IOPORT.50155830,
    author       = {Czabarka, \'Eva and Dankelmann, Peter and Sz\'ekely, L\'aszl\'o A.},
    title        = {Diameter of 4-colourable graphs},
    year         = {2009},
    journal      = {Eur. J. Comb.},
    volume       = {30},
    number       = {5},
    pages        = {1082-1089},
    doi          = {10.1016/j.ejc.2008.09.005},
    identifier   = {50155830},
}