Mourer-Chauvire, Berthet & Hugueney 2004. The Late Oligocene birds of the Crechy quarry (Allier, France), with a description of two new genera (Aves: Pelecaniformes: Phalacrocoracidae, and Anseriformes: Anseranatidae). Senckenbergiana Lethaea, 84(1-2), 30 Dezember 2004: 303-315