author={Ignacio Mart'in-Navarro and Pablo G. P'erez-Gonz'alez and Ignacio Trujillo and Pilar Esquej and Alexandre Vazdekis and Helena Dom'inguez S'anchez and Guillermo Barro and Gustavo Bruzual and St{\'e}phane Charlot and Antonio Cava and Ignacio Ferreras and N{\'e}stor Espino and Francesco La Barbera and Anton M. Koekemoer and A. J. Cenarro},
  journal={The Astrophysical Journal},
We explore the stellar initial mass function (IMF) of a sample of 49 massive quiescent galaxies (MQGs) at 0.9 10(11) M-circle dot), we find an average age of 1.7 +/- 0.3 Gyr and a bottom-heavy IMF (Gamma(b) = 3.2 +/- 0.2). Lighter MQGs (2 x 10(10) < M < 10(11) M-circle dot) at the same redshift are younger on average (1.0 +/- 0.2 Gyr) and present a shallower IMF slope (Gamma(b) = 2.7(-0.4)(+0.3)). Our results are in good agreement with the findings about the IMF slope in early-type galaxies of… 
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