Full evolutionary models for PG 1159 stars. Implications for the helium-rich O(He) stars Miller Bertolami & Althaus 2006, A&A, 454, 845
The formation and evolution of hydrogen-deficient post-AGB white dwarfs: The emerging chemical profile and the expectations for the PG 1159-DB-DQ evolutionary connection Althaus, Serenelli, Panei et al. 2005, A&A, 435, 631