OSO-8 Observations of Cygnus XR-1 Dolan, J. F. ; Dennis, B. R. ; Crannell, C. J. ; Frost, K. J. ; Orwig, L. E. Abstract Publication: Highlights of Astronomy Pub Date: 1977 DOI: 10.1017/S1539299600002434 Bibcode: 1977HiA.....4A..99D