Radio-loud ROSAT sources near the North Ecliptic Pole W. Brinkmann, M. Chester, R. Kollgaard, E. Feigelson, W. Voges and P. Hertz Astron. Astrophys. Suppl. Ser., 134 2 (1999) 221-240 Published online: 15 January 1999 DOI: 10.1051/aas:1999136