1. Conservative graphs;Bange;J. Graph Theory,1980
2. Magic Labelings of Directed Graphs;Barone,2008
3. Magic digraphs;Bloom;J. Combin. Math. Combin. Comput.,2008
4. Sparse Semi-Magic Squares and Vertex Magic Labelings;Gray;Ars Combin.,2006
5. Magic vertex labelings of digraphs;Marr;Int. J. Math. Comput. Sci.,2009