Outburst of GX 304–1 monitored with INTEGRAL: positive correlation between the cyclotron line energy and flux
D. Klochkov, V. Doroshenko, A. Santangelo, R. Staubert, C. Ferrigno, P. Kretschmar, I. Caballero, J. Wilms, I. Kreykenbohm, K. Pottschmidt, R. E. Rothschild, C. A. Wilson-Hodge and G. Pühlhofer
A&A, 542 (2012) L28
DOI: https://doi.org/10.1051/0004-6361/201219385
