Lorenzon, Maria C. A., et al. “Behavior of <i>Trigona spinipes< I> (Hymenoptera: Apidae) on Flowering Onion Fields”. Pesquisa Agropecuaria Brasileira, vol. 28, no. 2, Feb. 1993, pp. 217-21, doi:10.1590/S1678-3921.pab1993.v28.3868.