Małafiejski, Michał (2004), "Sum coloring of graphs", in Kubale, Marek (ed.), Graph Colorings, Contemporary Mathematics, vol. 352, Providence, RI: American Mathematical Society, pp. 55–65, doi:10.1090/conm/352/06372, MR2076989
doi.org
Małafiejski, Michał (2004), "Sum coloring of graphs", in Kubale, Marek (ed.), Graph Colorings, Contemporary Mathematics, vol. 352, Providence, RI: American Mathematical Society, pp. 55–65, doi:10.1090/conm/352/06372, MR2076989