Location of Unidentified Weak X-Ray Sources by the HEAO-1 Scanning Modulation Collimator Schwartz, D. A. ; Bradt, H. V. ; Briel, U. ; Dower, R. ; Doxsey, R. ; Fabiano, G. ; Griffiths, R. ; Gursky, H. ; Johnston, M. ; Leach, R. ; Liller, W. ; Ramsey, A. ; Schwarz, J. Abstract Publication: X-ray Astronomy Pub Date: 1979 Bibcode: 1979xras.proc..435S