1. Graph Theory with Application;Bondy,1976
2. The l(2, 1)-labeling problem on oriented regular grids;Calamoneri;Comput. J.,2011
3. Distance-two labelings of digraphs;Chang;Discret. Appl. Math.,2007
4. The l(2, 1)-labeling problem on ditrees;Chang;Ars Comb.,2003
5. t-colorings of graphs and the channel assignment problem;Cozzens;Congr. Numer.,1982