Corliss, Bruce H.; Aubry, Marie-Pierre; Berggren, W. A.; Fenner, Juliane M.; Keigwin, Lloyd D., Jr.; Keller, Gerta (1984): The Eocene/Oligocene boundary event in the deep sea. American Association for the Advancement of Science, Washington, DC, United States, Science, 226 (4676), 806-810, georefid:1985-034815