Media type: E-Article Title: Vanishing theorems and string backgrounds Contributor: Ivanov, S; Papadopoulos, G Published: IOP Publishing, 2001 Published in: Classical and Quantum Gravity, 18 (2001) 6, Seite 1089-1110 Language: Not determined DOI: 10.1088/0264-9381/18/6/309 ISSN: 0264-9381; 1361-6382 Origination: Footnote: