Sano, E. E., Assad, E. D., Moreira, L., & Macedos, J. (1992). Structure of environmental data of experimental fields of embrapa/cpac using geographic information system. Pesquisa Agropecuaria Brasileira, 27(12), 1615–1622. https://doi.org/10.1590/S1678-3921.pab1992.v27.3811