1. Aber J. D., Melillo J. M., and Federer C. A. (1982) ‘Predicting the effects of rotation length, harvest intensity, and fertilization on fiber yield from northern hardwood forests in New England’, Forest Science 28,31–45.
2. Ajtay, G. L., P. Ketner, and P. Duvigneaud. (1979) ‘Terrestrial primary production and phytomass’, in B. Bolin, E. T. Degens, S. Kempe, and P. Ketner (eds.), The Global Carbon Cycle, SCOPE 13, John Wiley and Sons, New York, pp. 129–181.
3. Armentano T. V. (ed.) (1980) The role of organic soils in the world carbon cycle CONF-7905135, United States Department of Energy, Washington, D. C.
4. Barnola J. M., Raynaud D., Korotkevich Y. S., and Lorius C. (1987) ‘Vostok ice core provides 1600,000-year record of atmospheric CO2’, Nature 329,408–414.
5. Billings W. C., Luken, J. O., Mortensen, D. A., Peterson, K. M. (1983) ‘Increasing carbon dioxide: Possible effects on arctic tundra’, Oecologia 58, 286–289.