Noga Alon Guillaume Fertin Arthur L. Liestman Thomas C. Shermer Ladislav Stacho Factor d-domatic colorings of graphs. 17-25 2003 262 Discret. Math. 1-3 https://doi.org/10.1016/S0012-365X(02)00518-6 db/journals/dm/dm262.html#AlonFLSS03