1. Mathematical Recreations and Essays;Ball,1973
2. The complexity of backtrack searches;Carter,1985
3. Independent permutations, as related to a problem of Moser and a theorem of Póyla;Chandra;J. Combin. Theory,1974
4. Notes on structured programming;Dijkstra,1972
5. Coordinated Computing: Tools and Techniques for Distributed Software;Filman,1984