Out of the icehouse into the greenhouse: a late Paleozoic analogue for modern global vegetational changev. 6Geological Society of America1–7
Gastaldo, Robert A., DiMichele, William A., and Pfefferkorn, H. W. 1996. "Out of the icehouse into the greenhouse: a late Paleozoic analogue for modern global vegetational change." GSA Today, 6 1–7.