Geron, Luiz Juliano Valério, et al. “Ingestive Behavior of Nellore Heifers Grazing Receiving the Supplement Based on Propolis or Monensin”. Semina: Ciências Agrárias, vol. 35, no. 4, Aug. 2014, pp. 2047-62, doi:10.5433/1679-0359.2014v35n4p2047.