1. Bolin, B. ‘The carbon cycle.’ Scientific American, 223, (3), 125 (1970).
2. Eckardt, F.E. (Ed.). ‘Functioning of terrestrial ecosystems at the primary production level.’ UNESCO Symposium at Copenhagen, Paris (1968).
3. Eckardt, F.E. (Ed.). ‘Methodology of plant ecophysiology.’ UNESCO Symposium at Montpellier, Paris (1965).
4. Woodwell, G.M. and Whittaker, R.H. ‘Primary production in terrestrial ecosystems.’ Am. Zoologist. 8, 19 (1968).
5. Fiala, K., Dykyjova, D., Kvet, J. and Svoboda, J. ‘Methods of assessing rhizophere and root production in reed bed stands.’ In Methods of productivity studies in root systems and rhizosphere organisms. USSR Academy of Sciences, Leningrad, 36 (1968).