Lectures to be published in the proceedings of the XIII
Canary Islands Winter School of Astrophysics
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astro-ph/0207500
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Abstract. The methods of abundance determinations in H II regions and planetary nebulae are described, with emphasis on the underlying assumptions and inherent problems. Recent results on abundances in Galactic H II regions and in Galactic and extragalactic Planetary Nebulae are reviewed.
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