1. V.C. Barbosa, Concurrency in systems with neighborhood constraints, Ph.D. Dissertation, Computer Science Dept. University of California, Los Angeles, 1986
2. V.C. Barbosa, E. Gafni, Concurrency in systems with neighborhood constraints, in: Proceedings of the 7th International Conference on Distributed Computing Systems, Washington, D.C., Sept. 1987, pp. 448–455
3. Concurrency in heavily loaded neighborhood-constrained systems;Barbosa;ACM Trans. Program. Lang. Syst.,1989
4. The circular chromatic number of a digraph;Bokal;J. Graph Theory,2004
5. Homomorphisms to powers of digraphs;Brewster;Discrete Math.,2002