The Swift-BAT survey reveals the orbital period of three high-mass X-ray binariesA. D’Aì, V. La Parola, G. Cusumano, A. Segreto, P. Romano, S. Vercellone and N. R. RobbaA&A, 529 (2011) A30DOI: https://doi.org/10.1051/0004-6361/201016401
