A dual emission mechanism in Sgr A*/L′? Y. Clénet, D. Rouan, D. Gratadour, O. Marco, P. Léna, N. Ageorges and E. Gendron A&A, 439 2 (2005) L9-L13 Published online: 29 July 2005 DOI: 10.1051/0004-6361:200500146