Core graphs and L(2,1)-labelling
Zhang Zhong-fu · Journal of Lanzhou University · 2008
The L(2,1)-labelling arose from a variation of the channel assignment problem.The paper defined a core graph G_(core) of a graph G and investigated some properties.Also,some results on the L(2,1)- labelling of graphs were studied.Finally two short proofs were given for two known important results on