Media type: E-Article Title: NLTE determination of the calcium abundance and 3D corrections in extremely metal-poor stars Contributor: Spite, Monique [Other]; Caffau, Elisabetta [Other]; Ludwig, Hans-Günter [Other] imprint: 2012 Published in: Astronomy and astrophysics ; 541(2012), 5, Seite A143 Language: English DOI: 10.1051/0004-6361/201218773 ISSN: 1432-0746 Identifier: Origination: Footnote: Access State: Open Access