Martinez, H.E., Pitelli, R.A. and Haag, H.P. (1977) “ Mineral nutrition of cerrado species I: inorganic chemical composition of Byrsonima coccolobifolia (Sp) kunth, Kielmeyera coriacea (Sp) mart and ‘shurb’ (Polypodiaceae) ”, Anais da Escola Superior de Agricultura Luiz de Queiroz, 34, pp. 415–426. doi:10.1590/S0071-12761977000100031.