On the origin of cyclotron lines in the spectra of X-ray pulsarsA. A. Mushtukov, J. Poutanen, V. F. Suleimanov, S. S. Tsygankov, D. I. Nagirner, V. Doroshenko and A. A. LutovinovEPJ Web of Conferences, 64 (2014) 02005DOI: https://doi.org/10.1051/epjconf/20136402005