Identification of a complete sample of northern ROSAT All-Sky Survey X-ray sources Zickgraf, F. -J. ; Krautter, J. ; Appenzeller, I. ; Thiering, I. ; Voges, W. ; Mujica, R. ; Pakull, M. W. ; Serrano, A. ; Chavarria, C. Abstract Poster paper Publication: Astronomische Nachrichten Pub Date: 1998 DOI: 10.1002/asna.2123190121 Bibcode: 1998AN....319...42Z