@article{articled978b97a,
title   = {Planetary nebulae in the inner Milky Way II: the bulge-disk transition},
author = {Cavichia, O and Costa, Roberto Dell'Aglio Dias da and Maciel, Walter Junqueira},
year = {2011},
journal   = {Revista Mexicana de Astronomía y Astrofísica}
}