ESA Study of XEUS, A Potential Follow-on to XMM-Newton Rando, N. ; Lyngvi, A. ; Gondoin, P. ; Lumb, D. ; Bavdaz, M. ; Verhoeve, P. ; de Wilde, D. ; Parmar, A. ; Peacock, T. Abstract Publication: ESA Special Publication Pub Date: June 2006 Bibcode: 2006ESASP.621E..30R