Maia-Silva, C.; Imperatriz-Fonseca, V. L.; Silva, C. I.; Hrncir, M. Environmental Windows for Foraging Activity in Stingless Bees, Melipona Subnitida Ducke and Melipona Quadrifasciata Lepeletier (Hymenoptera: Apidae: Meliponini). Sociobiology 2014, 61, 378-385.