M. Bejger (CAMK)
J. Klimentowski (CAMK)
(arXiv:0808.3772)
A. Janiuk (CAMK)
(Komossa et al., ApJ, 2008, 678, L81 [arXiv:0804.4585])
K. Złoczewski (CAMK)
(Bournaud et al.: MNRAS Letters, 2008, 389, L8 and arXiv:0809.1029)
Jonathan M.B. Downing (Heidelberg)
M. Różyczka (CAMK)
(based on several not-so-recent papers, e.g. Rucinski et al. 2007; AJ 134, 2353 and own results)
J. Smak (CAMK)
(D.P.Kjurkchieva, D.V.Marchev, S.Zoła, MNRAS 382, 835, 2007 and new unpublished results)