Souza, E.B. de et al. 2017. GRID SAMPLE FOR SPATIAL STUDY OF PENETRATION RESISTENCE IN THE ELEPHANT GRASS FARMING AREA. BRAZILIAN JOURNAL OF AGRICULTURE - Revista de Agricultura. 92, 3 (dez. 2017), 281–294. DOI:https://doi.org/10.37856/bja.v92i3.215.