XMM-Newton observation of the ultraluminous quasar SDSS J010013.02+280225.8 at redshift 6.326 - Ai, Yanli; Fabian, A. C.; Fan, Xiaohui; Walker, S. A.; Ghisellini, G.; Sbarrato, T.; Dou, Liming; Wang, Feige; Wu, Xue-Bing; Feng, Longlong (2017)