Optical properties of active galaxies with ultra-soft X-ray spectra
E. M. Puchnarewicz(University College London), J. R. Allington‐Smith(Durham University), J. F. Kartje(Pennsylvania State University), K. O. Mason(University of Calgary), Paul Murdin(Royal Observatory in Greenwich), F. Cordova(Pennsylvania State University), G. Branduardi‐Raymont(University College London), J. P. D. Mittaz(University College London)
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