Discovery of slow X-ray pulsations in the high-mass X-ray binary 4U 2206+54 P. Reig, J. M. Torrejón, I. Negueruela, P. Blay, M. Ribó and J. Wilms A&A, 494 3 (2009) 1073-1082 Published online: 11 December 2008 DOI: 10.1051/0004-6361:200810950