Unveiling the nature of INTEGRAL objects through optical spectroscopy - IV. A study of six new hard X-ray sourcesN. Masetti, L. Bassani, A. Bazzano, A. J. Bird, A. J. Dean, A. Malizia, L. Norci, E. Palazzi, A. D. Schwope, J. B. Stephen, P. Ubertini and R. WalterA&A, 455 1 (2006) 11-19DOI: https://doi.org/10.1051/0004-6361:20065111
