A puzzling paucity of double peaked X-ray pulsars T. Bulik, D. Gondek-Rosińska, A. Santangelo, T. Mihara, M. Finger and M. Cemeljic A&A, 404 3 (2003) 1023-1032 Published online: 06 June 2003 DOI: 10.1051/0004-6361:20030555