Christopher C. M. Kyba, Kai Pong Tong, Jonathan Bennie, Ignacio Birriel, Jennifer J. Birriel, Andrew Cool, Arne Danielsen, Thomas W. Davies, Peter N. den Outer, William Edwards, Rainer Ehlert, Fabio Falchi, Juergen Fischer, Andrea Giacomelli, Francesco Giubbilini , Marty Haaima, Claudia Hesse, Georg Heygster, Franz Hoelker, Richard Inger, Linsey J. Jensen,Helga U. Kuechly, John Kuehn , Phil Langill , Dorien E. Lolkema, Matthew Nagy, Miguel Nievas, Nobuaki Ochi, Emil Popow, Thomas Posch, Johannes Puschnig, Thomas Ruhtz, Wim Schmidt, Robert Schwarz, Axel Schwope, Henk Spoelstra, Anthony Tekatch, Mark Trueblood , Constance E. Walker, Michael Weber, Douglas L. Welch, Jaime Zamorano & Kevin J. Gaston, Worldwide variations in artificial skyglow, Scientific Reports 5, Article number: 8409 (2015)