Rodrigues, R. C., Araújo, R. A., Costa, C. S., Lima, A. J., Oliveira, M. E., Cutrim Jr, J. A., Santos, F. N., Araújo, J. S., Santos, V. M. and Araújo, A. S. (2015) “Soil microbial biomass in an agroforestry system of Northeast Brazil”, Tropical Grasslands-Forrajes Tropicales, 3(1), pp. 41–48. doi: 10.17138/tgft(3)41-48.