Freeman, Katherine H.; Pancost, Richard D.; Patzkowsky, Mark E.; Joachimski, Michael M. (1998): Organic molecular records and carbon-isotope excursions; can we decipher Paleozoic CO2 events?. American Geophysical Union, Washington, DC, United States, In: Anonymous, AGU 1998 fall meeting, 79 (45, Suppl.), 405, georefid:2005-045186