Multi-wavelength observations of Galactic hard X-ray sources discovered by INTEGRAL - I. The nature of the companion starS. Chaty, F. Rahoui, C. Foellmi, J. A. Tomsick, J. Rodriguez and R. WalterA&A, 484 3 (2008) 783-800DOI: https://doi.org/10.1051/0004-6361:20078768
