Souza, Carlos Alberto Spaggiari, et al. “Development and Nutrient Levels of Coffee Seedlings Inoculated With Mycorrhizal Fungi. Effect of Organic Matter and Simple Superphosphate”. Pesquisa Agropecuaria Brasileira, vol. 26, no. 11/12, Oct. 1991, pp. 1989-05, doi:10.1590/S1678-3921.pab1991.v26.3553.