Media type: E-Article Title: ‘Nonlinear’ positive mappings for density matrices Contributor: Brüning, Erwin; Petruccione, Francesco imprint: Elsevier BV, 2010 Published in: Physica E: Low-dimensional Systems and Nanostructures Language: English DOI: 10.1016/j.physe.2009.06.017 ISSN: 1386-9477 Keywords: Condensed Matter Physics ; Atomic and Molecular Physics, and Optics ; Electronic, Optical and Magnetic Materials Origination: Footnote: