@conference {bandemer09-isit, title = {On the Sum Capacity of A Class of Cyclically Symmetric Deterministic Interference Channels}, booktitle = {2009 IEEE International Symposium on Information Theory (ISIT 2009)}, year = {2009}, month = {June 28-July 3}, address = {Coex, Seoul, Korea}, author = {Bandemer, Bernd and Vazquez-Vilar, Gonzalo and El Gamal, Abbas} }