https://old.e-afe.fr/produit/proceedings-of-a-symposium-of-cie-tc-4-21-on-urban-sky-glow-a-worry-for-astronomy/ Association Française de l'éclairage Fri, 22 May 2015 10:39:12 +0000 hourly 1 https://wordpress.org/?v=6.7.2