@article{articledd0aaf79,
title   = {Age distribution of the central stars of galatic disk planetary nebulae},
author = {Maciel, Walter Junqueira and Costa, Roberto Dell'Aglio Dias da and Idiart, Thais Eunice Pires},
year = {2010},
doi = {10.1051/0004-6361/200912499},
journal   = {Astronomy & Astrophysics}
}