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- [26] EXTRA-GALACTIC X-RAY SOURCES AND THE DIFFUSE-X-RAY BACKGROUND PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 1979, 366 (1726): : 391 - 402
- [29] X-RAY SELECTED ACTIVE GALACTIC NUCLEI FROM EINSTEIN-OBSERVATORY OBSERVATIONS BULLETIN OF THE AMERICAN PHYSICAL SOCIETY, 1980, 25 (04): : 510 - 510
- [30] PRECISE LOCATIONS OF GLOBULAR-CLUSTER X-RAY SOURCES OBSERVED BY THE EINSTEIN-OBSERVATORY BULLETIN OF THE AMERICAN PHYSICAL SOCIETY, 1979, 24 (04): : 584 - 584