dos Santos, H. P., & Reis, E. M. (1995). Crop rotation in Guarapuava, PR Brazil. XVI. Energetic efficiency of rotation systems for wheat, under no-tillage. Pesquisa Agropecuaria Brasileira, 30(2), 215–222. https://doi.org/10.1590/S1678-3921.pab1995.v30.4295