Duddy, I. R.; Gleadow, A. J. W.; Keene, John B. (1984): Fission track dating of apatite and sphene from Paleogene sediments of Deep Sea Drilling Project Leg 81, Site 555. Texas A & M University, Ocean Drilling Program, College Station, TX, United States, In: Roberts, David G., Schnitker, Detmar, Baldauf, Jack G., Desprairies, Alain, Homrighausen, Reiner, Huddlestun, Paul F., Kaltenback, Alfred J., Krumsiek, Klaus A. O., Morton, Andrew C., Murray, John W., Westberg-Smith, M. Jean, Zimmerman, Herman B., Keene, John B., Backman, Jan (editor), Initial reports of the Deep Sea Drilling Project covering Leg 81 of the cruises of the drilling vessel Glomar Challenger; Southampton, United Kingdom, to Ponta Delgada, Azores Islands, July-September, 1981, 81, 725-729, georefid:1985-047623