1. Labeling planar graphs with a condition at distance two;Bella;European J. Combin.,2007
2. Approximations for λ-coloring of graphs;Bodlaender;Comput. J.,2004
3. Graph Theory;Bondy,2008
4. R.J. Bruce, M. Hoffmann, L(p,q)-labeling of outerplanar graphs, Technical Report No. 2003/9, Department of Mathematics and Computer Science, University of Leicester, England.
5. The L(h,k)-labelling problem: an updated survey and annotated bibliography;Calamoneri;Comput. J.,2011