Castro, M. M. do N., C. A. Garófalo, J. C. Serrano, and C. I. Silva. “Temporal Variation in the Abundance of Orchid Bees (Hymenoptera: Apidae) in a Neotropical Hygrophilous Forest”. Sociobiology, vol. 60, no. 4, Dec. 2013, pp. 405-12, doi:10.13102/sociobiology.v60i4.405-412.