H. Poorter, C. Roumet, and B. Campbell. chapter Interspecific variation in the growth response of plants to elvated CO2: A search for functional types, page 375--412. Academic Press, (1996)
J. Buckley. Report on Cooperative Agreement, DE-FC22-96ID13421. Petroleum Recovery Research Center, New Mexico Institute of Mining and Technology, Socorro, New Mexico, (October 1997)