Study of the accreting pulsar 4U 0115+63 using a bulk and thermal Comptonization modelC. Ferrigno, P. A. Becker, A. Segreto, T. Mineo and A. SantangeloA&A, 498 3 (2009) 825-836DOI: https://doi.org/10.1051/0004-6361/200809373