... and P. Spirakis, Frequency assignment in mobile and radionetworks, in Proceedings of the Workshop on Networks in Distributed Computing, DIMACS Se-ries. AMS, 1998. 11. D. A. Fotakis and P. ... 15. J. R. Griggs and R. K. Yeh, Labeling graphs with a condition at distance 2, SIAM J. Discr. Math.,5: 586–595, 1992. REFERENCES115directly to the following bound, adapted from [12]. For any ... one, which indicatesthat channels assigned to the corresponding cells must be distinct, is often referred to as acochannel constraint. An intersite constraint of two, which codifies the requirement...