J. R. Koser, F. de O. Francisco, and G. Moretto, “Genetic Variability of Stingless Bees Melipona mondury Smith and Melipona quadrifasciata Lepeletier (Hymenoptera: Apidae) from a Meliponary”, Sociobiology, vol. 61, no. 3, pp. 313–317, Sep. 2014.