Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL
"Eckardt, F. E. and Kongelige Danske videnskabernes selskab and Denmark. Danske UNESCO-nationalkommission and Copenhagen Symposium [Functioning of Terrestrial Ecosystems at the Primary Production Level]",Functioning of terrestrial ecosystems at the primary production level : proceedings of the Copenhagen Symposium = Fonctionnement des écosystèmes terrestres au niveau de la production primaire : actes du colloque de Copenhague,,Unesco,1968,Natural resources research,,,,https://cir.nii.ac.jp/crid/1130000797112742912