Copenhagen Symposium on Functioning of Terrestrial Ecosystems at the Primary Production Level & Eckardt, F. (1968). Functioning of terrestrial ecosystems at the primary production level: Proceedings of the Copenhagen Symposium held in Copenhagen from 24 to 30 July 1965. United Nations Educational, Scientific and Cultural Organization.

Copenhagen Symposium on Functioning of Terrestrial Ecosystems at the Primary Production Level and F.E Eckardt. Functioning of Terrestrial Ecosystems at the Primary Production Level: Proceedings of the Copenhagen Symposium Held in Copenhagen from 24 to 30 July 1965. Paris: United Nations Educational, Scientific and Cultural Organization, 1968.

Copenhagen Symposium on Functioning of Terrestrial Ecosystems at the Primary Production Level and F.E Eckardt. Functioning of Terrestrial Ecosystems at the Primary Production Level: Proceedings of the Copenhagen Symposium Held in Copenhagen from 24 to 30 July 1965. United Nations Educational, Scientific and Cultural Organization, 1968.