Melo, A. M. C.; Viana, B. F.; Neves, E. L. Pattern of Floral Resource Use by Two Species of Melipona Illiger, 1806 (Hymenoptera: Apidae) in Continental Sand Dunes from Medium São Francisco River, Bahia, Brazil. Sitientibus sér. Ci. Biol. 2002, 2, 17-22.