Media type: E-Article Title: Positive interactions among plants Contributor: Callaway, Ragan M. Published: Springer Science and Business Media LLC, 1995 Published in: The Botanical Review, 61 (1995) 4, Seite 306-349 Language: English DOI: 10.1007/bf02912621 ISSN: 0006-8101; 1874-9372 Origination: Footnote: