Media type: E-Article Title: Negativity and Contextuality are Equivalent Notions of Nonclassicality Contributor: Spekkens, Robert W. imprint: American Physical Society (APS), 2008 Published in: Physical Review Letters Language: English DOI: 10.1103/physrevlett.101.020401 ISSN: 0031-9007; 1079-7114 Origination: Footnote: