FREITAS, M. F. H. DE; SIQUEIRA, J. O. Mycelial growth of pre-germinated spores of the endomycorrhizal fungus Gigaspora gigantea in liquid medium supplemented with nitrogenous organic compounds. Pesquisa Agropecuaria Brasileira, v. 29, n. 5, p. 751–756, 1 May1994.