Media type: E-Article Title: A practical study of the electron-density-map variance Contributor: Giacovazzo, Carmelo; Mazzone, Annamaria Published: International Union of Crystallography (IUCr), 2012 Published in: Acta Crystallographica Section A Foundations of Crystallography, 68 (2012) 4, Seite 464-469 Language: Not determined DOI: 10.1107/s0108767312015772 ISSN: 0108-7673 Origination: Footnote: