Alexandr V. Kostochka Kittikorn Nakprasit Sriram V. Pemmaraju On Equitable Coloring of d-Degenerate Graphs. 83-95 2005 19 SIAM J. Discrete Math. 1 http://dx.doi.org/10.1137/S0895480103436505 db/journals/siamdm/siamdm19.html#KostochkaNP05