Santos, H.P. dos et al. 1995. Crop productivity of wheat rotation systems for ten-year period, in Passo Fundo, RS, Brazil. Pesquisa Agropecuaria Brasileira. 30, 12 (Dec. 1995), 1397–1402. DOI:https://doi.org/10.1590/S1678-3921.pab1995.v30.4439.