Physiological and genetic mechanisms underlying caste development, reproduction and division of labor in stingless bees Klaus Hartfelder, Gustavo R. Makert, Carla C. Judice, Gonçalo A.G. Pereira, Weyder C. Santana, Rodrigo Dallacqua and Márcia M.G. BitondiApidologie, 37 2 (2006) 144-163DOI: https://doi.org/10.1051/apido:2006013