Penney, D.; Wadsworth, C.; Green, D. I.; Kennedy, S. L.; Preziosi, R. F.; Brown, T. A. Extraction of Inclusions from (sub)fossil Resins, With Description of a New Species of Stingless Bee (Hymenoptera: Apidae: Meliponini) in Quaternary Colombian Copal. paleocontributions 2013, 1-6.