An estimate of the time variation of the abundance gradient from planetary nebulae. II. Comparison with open clusters, cepheids and young objects
MACIEL, W. J ; LAGO, L. G ; COSTA, R. D. D
Astronomy and astrophysics (Berlin), 2005-04, Vol.433 (1), p.127-135 [Revista revisada por pares]Les Ulis: EDP Sciences
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