Ferreira, E.A. et al. 2012. Micromorphological characteristics of barnyardgrass biotypes resistant and susceptible to quinclorac. Pesquisa Agropecuaria Brasileira. 47, 8 (Sep. 2012), 1048–1056. DOI:https://doi.org/10.1590/S1678-3921.pab2012.v47.12513.