Extended Red Emission and the evolution of carbonaceous nanograins in NGC 7023 O. Berné, C. Joblin, M. Rapacioli, J. Thomas, J.-C. Cuillandre and Y. Deville A&A, 479 3 (2008) L41-L44 Published online: 17 January 2008 DOI: 10.1051/0004-6361:20079158