1. Theorie des Graphes et Ses Aplications;Berge,1962
2. A note on the application of graph theory to digital computer programming;Karp;Inform. Control,1960
3. Report on the algorithmic language Algol 60,1960
4. Automatic preparation of flowchart listings;Scott;J. Assoc. Computing Mach.,1958
5. Linear Graphs and Electrical Networks;Seshu,1961