Sasvári, Z., and K. Posta. “Effect of Different Plant Densities on the Diversity of Arbuscular Mycorrhizal Fungi Community in a Long-Term Maize Monocrop System”. Spanish Journal of Agricultural Research, Vol. 8, no. S1, July 2010, pp. 123-30, doi:10.5424/sjar/201008S1-1231.