Four Sources which show X-ray Behaviour similar to Sco X-1 Mason, K. O. ; Charles, P. A. ; White, N. E. ; Culhane, J. L. ; Sanford, P. W. ; Strong, K. T. Abstract Publication: Bulletin of the American Astronomical Society Pub Date: June 1976 Bibcode: 1976BAAS....8..443M