IBM z13 firmware innovations for simultaneous multithreading and I/O virtualization. - Christine Axnix; Gerd Bayer; Harald Böhm; Joachim von Buttlar; Mark S. Farrell; Lisa Cranton Heller; Jeffrey P. Kubala; Seth E. Lederer; Raymond Mansell; Angel Nuñez Mencias; Stefan Usenbinz (IBM J. Res. Dev., 2015)