It is estimated that there are over 20,000 research papers on mycorrhizae. Included herein is some of the work of:

International Conference on Mycorrhizae (ICOM) - Searchable Abstracts

International Culture Collection of Arbuscular Mycorrhizal Fungi (INVAM) - Great site with protocols for measurement of inoculum value

USDA Research Data Base on Mycorrhiza - Extensive listing of over 500 studies

International Mycorrhiza Society - Dr. Robert M. Augé - Professor, University of Tennessee, Knoxville - Great web site on mycorrhizae.

International Mycorrhiza Society Searchable Database - Abstracts

Mycorrhiza Crash Course - Great site to educate yourself on mycorrhiza

Paper on measurement methods employed to determine mycorrhizal potential/colonization

USDA Forest Service Research Publications Online - Limited, but good

Research by species of mycorrhizae used in DIEHARD™ inoculants
(Approx. 1 minute load time with a slow connection)