submitted by the Trustees of Columbia University in the City of New York ; prepared by Columbia Astrophysics Laboratory, Departments of Astronomy and Physics, Columbia University ; principal investigators, Jules P. Halpern & Karen M. Leighly.
In: "Monitoring MRK 509 [microform] : the origin of the reprocessor" and "Broad band X-ray spectrum of narrow line Seyfert 1 AKN 564" / submitted by the Trustees of Columbia University in the City of New York ; prepared by Columbia Astrophysics Laboratory, Departments of Astronomy and Physics, Columbia University ; principal investigators, Jules P. Halpern & Karen M. Leighly.; (1998)
