J. Almeida Braga, Érika Oliveira Sales, J. Soares Neto, M. Menezes Conde, O. Monika Barth, and M. C. Lorenzon, “Floral sources to Tetragonisca angustula (Hymenoptera: Apidae) and their pollen morphology in a Southeastern Brazilian Atlantic Forest”, Rev. Biol. Trop., vol. 60, no. 4, pp. 1491–1501, Dec. 2012.