1. Respiration rates of apple trees, estimated by CO2-efflux measurements;Butler;Pl. Cell Envir.,1981
2. First report of the German Houses of Parliament, Bonn on “Schutz der Erdatmosphäre” dated 25 April 1991 and “Klimaänderung gefährdet globale Entwicklung; Zukunft sichern — Jetzt handeln”;Enquete-Commission;Circular 12/419,1991
3. The daily rate of photosynthesis, during the season of 1935, of a young apple tree of bearing age;Heinicke,1937
4. Increasing atmospheric CO2: Effects on crop yield, water use and climate;Kimball;Agric. Wat. Manage.,1983
5. Environmentally induced response of apple tree photosynthesis;Lakso;Hort-Sci.,1978