Media type: E-Article Title: What is the relativistic spin operator? Contributor: Bauke, Heiko; Ahrens, Sven; H Keitel, Christoph; Grobe, Rainer Published: IOP Publishing, 2014 Published in: New Journal of Physics, 16 (2014) 4, Seite 043012 Language: Not determined DOI: 10.1088/1367-2630/16/4/043012 ISSN: 1367-2630 Origination: Footnote: Access State: Open Access