@inproceedings{inproceedingsc3026e5e,
title   = {Ages of central stars of planetary nebulae},
author = {Maciel, Walter Junqueira and Costa, Roberto Dell'Aglio Dias da and Idiart, Thais Eunice Pires},
year = {2009},
publisher = {Cambridge University Press},
booktitle   = {IAU Symposium}
}