Cassiopeia A: On the origin of the hard X-ray continuum and the implication of the observed O Ly-α/Ly-β distributionJ. A. M. Bleeker, R. Willingale, K. van der Heyden, K. Dennerl, J. S. Kaastra, B. Aschenbach and J. VinkA&A, 365 1 (2001) L225-L230DOI: https://doi.org/10.1051/0004-6361:20000048
