Radio-loud ROSAT sources near the North Ecliptic PoleW. Brinkmann, M. Chester, R. Kollgaard, E. Feigelson, W. Voges and P. HertzAstron. Astrophys. Suppl. Ser., 134 2 (1999) 221-240DOI: https://doi.org/10.1051/aas:1999136