Identification of a complete sample of northern ROSAT All-Sky Survey X-ray sources - II. The optical observations
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Wolfgang Voges | F.-J. Zickgraf | Bodo L. Ziegler | Manfred W. Pakull | Immo Appenzeller | W. Voges | J. Krautter | I. Appenzeller | B. Ziegler | M. Pakull | F. Zickgraf | Á. Serrano | I. Thiering | J. Heidt | Jochen Heidt | R. Kneer | R. Mujica | Joachin Krautter | I. Thiering | C. Chavarria | A. Serrano | R. Kneer | C. Chavarría | R. Mújica | Joachim Krautter | M. W. Pakull
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