@article{article54bf6659,
title   = {Type i planetary nebulae in the large magellanic cloud: oxygen, sulphur and argon abundances as tracers of chemical enrichment},
author = {Freitas Pacheco, José Antonio and Barbuy, Beatriz Leonor Silveira and Costa, Roberto Dell'Aglio Dias da and Idiart, T E P},
year = {1993},
journal   = {Astronomy and Astrophysics}
}