by Revnivtsev, Mikhail G., Molkov, Sergey V.
Published in Monthly notices of the Royal Astronomical Society (11.08.2012)

by Henley, David B., Shelton, Robin L., Cumbee, Renata S., Stancil, Phillip C.
Published in The Astrophysical journal (01.02.2015)

by Sołtan, A. M., Freyberg, M. J., Hasinger, G.
Published in Astronomy and astrophysics (Berlin) (01.11.2002)

by Gomez-Pelaez, A. J, Moreno-Insertis, F
Published in The Astrophysical journal (20.04.2002)