O. Pols, R. Izzard, R. Stancliffe, и E. Glebbeek. (2012)cite arxiv:1209.6082Comment: Accepted for publication in Astronomy & Astrophysics. 11 pages, 5 figures, 3 tables and 1 online appendix.
A. Boesgaard, J. Rich, E. Levesque, и B. Bowler. (2011)cite arxiv:1110.2823
Comment: Accepted for Ap.J. Nov. 10, 2011, v. 741 70 pages, 27 figures, 5
tables.