Evolved stars suggest an external origin of the enhanced metallicity in planet-hosting starsL. Pasquini, M. P. Döllinger, A. Weiss, L. Girardi, C. Chavero, A. P. Hatzes, L. da Silva and J. SetiawanA&A, 473 3 (2007) 979-982DOI: https://doi.org/10.1051/0004-6361:20077814
