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Luminosity-dependent changes of the cyclotron line energy and spectral hardness in Cepheus X-4

V. Vybornov, D. Klochkov, M. Gornostaev, K. Postnov, E. Sokolova-Lapa, R. Staubert, K. Pottschmidt and A. Santangelo

A&A, 601 (2017) A126

DOI: https://doi.org/10.1051/0004-6361/201630275

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