Low-mass, helium-enriched PG 1159 stars: a possible evolutionary origin and implications for their pulsational stability propertiesL. G. Althaus, A. H. Córsico and M. M. Miller BertolamiA&A, 467 3 (2007) 1175-1180DOI: https://doi.org/10.1051/0004-6361:20066887
