The X-ray spectrum of the black hole candidate GX339-4 in a low state A. Corongiu, L. Chiappetti, F. Haardt, A. Treves, M. Colpi and T. Belloni A&A, 408 1 (2003) 347-352 Published online: 17 November 2003 DOI: 10.1051/0004-6361:20030923