Issue No. 06 - June (1981 vol. 30)
U.I. Gupta , Department of Electrical Engineering and Computer Science, Northwestern University
Since the publication of this paper it has been brought to our notice by Lauther, Persky et al., and Rubin that the channel assignment problem has been studied by Hashimoto and Stevens  and Kernighan et al. . These papers should have been cited and we regret the omission.
D. Lee, J. Leung and U. Gupta, "Authors' Reply<sup>2</sup>," in IEEE Transactions on Computers, vol. 30, no. , pp. 455, 1981.