, Science, vol.325, p.848, 2009.
, Astrophys. Journal, vol.712, p.957, 2010.
,
, Nature, vol.300, p.615, 1982.
, Nature, vol.333, p.237, 1988.
, Astrophys. Journal, 2011.
, Astrophys. Journal, submitted, 2011.
, Mon. Not. R. Astron. Soc, vol.400, p.951, 2009.
, , 2002.
, Astron. & Astrophys, vol.492, p.923, 2008.
, Astrophys. Journal, 2011.
, Astrophys. Journal Suppl, vol.188, p.405, 2010.
,