The FoCal prototype—an extremely fine-grained electromagnetic calorimeter using CMOS pixel sensors. (19th January 2018) - de Haas, A.P.; Nooren, G.; Peitzmann, T.; Reicher, M.; Rocco, E.; Röhrich, D.; Ullaland, K.; Brink, A. van den; Leeuwen, M. van; Wang, H.; Yang, S.; Zhang, C.