By Schulke Bradd   Waser Nickolas M.   in Oecologia

ISSN:0029-8549|127|2|239-245

Springer Publishing Company ‎(2001)‎

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By Waser Nickolas M   Price Mary V   in Perspectives in Plant Ecology, Evolution and Systematics

ISSN:1433-8319|1|2|137-150

Urban & Fischer‎(1998)‎

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