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Greco, Mark; Welz, Patricia M; Siegrist, Mark; Ferguson, Stephen J; Gallmann, Peter; Roubik, David W; Engel, Michael S (2011). Description of an ancient social bee trapped in amber using diagnostic radioentomology. Insectes sociaux, 58(4), pp. 487-494. Basel: SP Birkhäuser Verlag Basel 10.1007/s00040-011-0168-8
