NP - Completeness Results and Efficient Approximations for Radiocoloring in Planar Graphs CTI Technical Report No. TR2002/10/03 - Φωτάκης, Δημήτρης; Νικολετσέας, Σωτήρης; Παπαδοπουλου, Βικυ; Σπυράκης, Παύλος Γ.; FOTAKIS, DIMITRIS; NIKOLETSEAS, SOTIRIS; PAPADOPOULOU, VICKY; Σπυράκης, Παύλος Γ. (CTI, 2002)