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Astronomy & Astrophysics  (2006)

Unveiling the nature of INTEGRAL objects through optical spectroscopy - V. Identification and properties of 21 southern hard X-ray sources

Masetti N., Morelli; L., Palazzi E.; Galaz, G.; Bassani, L; Bazzano, A; Bird, AJ; Dean, AJ; Israel, GL; Landi, R; Malizia, A; Minniti D., Schiavone; F, Stephen; JB, Ubertini; P, Walter R.