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Eliminating light pollution
Mark von Rosing, Ivailo Tsvetkov, Ulrik Foldager, Lesley Shepperson, Hanka Czichos, Harald W.J. Spiegel, Harald Arnold, Neil Kemp, Bonnie S. Urquhart, Dickson Hunja Muhita, Wim Laurier, Andreas Thanner, Falk Alexander Schmidt, Jörg Warm, Hansrudi Ruoss, Marc Rosenberg, Nicole Koesling, Roland Raschke, Robert Wilke, Sascha Baae, Thomas Möck +20 moreopenaire +1 more source
