Media type: E-Article Title: Extremal positive semidefinite forms Contributor: Choi, Man-Duen; Lam, Tsit-Yuen Published: Springer Science and Business Media LLC, 1977 Published in: Mathematische Annalen, 231 (1977) 1, Seite 1-18 Language: English DOI: 10.1007/bf01360024 ISSN: 0025-5831; 1432-1807 Keywords: General Mathematics Origination: Footnote: Access State: Open Access