nRX J1856.5-3754
(Walter et al. 1996)
nRX J0720.4-3125
(Haberl et al. 1996)
nRX J0806.4-4132
(Haberl et al. 1998)
nRX J1605.3+3249 (RBS
1556, Schwope et al. 1999)
nRX J1308.6+2127 (RBS
1223, Schwope et al. 1999)
nRX J04020.0-5022
(Haberl et al. 1999)
n1RXS J214303.7+065419
(RBS 1774, Zampieri et al. 2001)