Design concepts for the Cherenkov Telescope Array CTA: an advanced facility for ground-based high-energy gamma-ray astronomy - Actis, Marcos; Becherini, Yvonne; Behera, Bagmeet; Emmanoulopoulos, Dimitrios; Hauser, Marcus; Pühlhofer, Gerd; Quirrenbach, Andreas; Tibolla, Omar; Wagner, Stefan (Experimental astronomy, 2011)