Friedrich Eisenbrand Stefan Funke Andreas Karrenbauer Domagoj Matijevic Energy-Aware Stage Illumination. 107-129 2008 18 Int. J. Comput. Geometry Appl. 1/2 http://dx.doi.org/10.1142/S0218195908002556 db/journals/ijcga/ijcga18.html#EisenbrandFKM08