Cal X-1: an absolute in-orbit calibrator for current and future X-ray observatories
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M. Markevitch | Harvard-Smithsonian CfA | T. Okajima | A. Holland | P. Plucinsky | Nist | K. Jahoda | Open University | Uk | Neerav Shah | J. Hill-Kittle | Denis Bergeron | Dan Schwarz Nasa Gsfc