HILTON A J W, de WERRA D. A sufficient condition for equitable edge-coloring of simple graphs [J]. Discrete Mathematics, 1994, (1/3):179-201.
[2]
de WERRA D. Equitable colorations of graphs [J]. Reveu Francaise d’Informatique et de Recherche Operationelle, 1971(3):3-8.
[3]
WU Jian-liang. The equitable edge-colouring of outerplanar graphs [J]. The Journal of Combinatorial Mathematics and Combinatorial Computing, 2001(1):247-253.