Bibliography

Kareiva, Peter M., and Mark D. Bertness, eds. "Special Feature: Re-Examining the Role of Positive Interactions in Communities." Ecology 78, vol. 7 (1997).

Raven, Peter H., Ray F. Evert, and Susan E. Eichhorn. Biology of Plants, 6th ed. New York: W. H. Freeman and Company, 1999.

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