Carvalho Filho, O.M. de and Languidey, P.H. 2014. A simple model of rumen cannula. Pesquisa Agropecuaria Brasileira. 19, 12 (Apr. 2014), 1537–1539. DOI:https://doi.org/10.1590/S1678-3921.pab1984.v19.16258.