Toljander, JF, JC Santos-Gonzalez, A Tehler, and RD Finlay, Community analysis of arbuscular mycorrhizal fungi and bacteria in the maize mycorrhizosphere in a long-term fertilization trial. FEMS Microbiology Ecology 65:323-338 (2008). doi:10.1111/j.1574-6941.2008.00512.x