Fotakis DA, Nikoletseas SE, Papadopoulou VG, Spirakis PG. HARDNESS RESULTS AND EFFICIENT APPROXIMATIONS FOR FREQUENCY ASSIGNMENT PROBLEMS: RADIO LABELLING AND RADIO COLORING. Comput. Inform. [Internet]. 2012 Jan. 26 [cited 2024 Nov. 23];20(2):121-80. Available from: http://147.213.75.17/ojs/index.php/cai/article/view/514