Sarah D. Kocher & Robert J. Paxton (2014): Comparative methods offer powerful insights into social evolution in bees. Apidologie 45 (3): 289–305, doi:10.1007/s13592-014-0268-3.
Aline C. Martins, Gabriel A.R. Melo, Susanne S. Renner (2014): The corbiculate bees arose from New World oil-collecting bees: Implications for the origin of pollen baskets. Molecular Phylogenetics and Evolution 80: 88–94, doi:10.1016/j.ympev.2014.07.003.