Raposo, João Antonio de Arruda, et al. “Intercropping of Corn and Bean in Different Plant Arrangements and Population, in Pelotas, RS”. Pesquisa Agropecuaria Brasileira, vol. 30, no. 5, May 1995, pp. 639-47, doi:10.1590/S1678-3921.pab1995.v30.4348.