1.
Johnsen E. Donald P. Eckman, ed.: Systems: Research and Design. John Wiley & Sons, New York and London, 1961. 310 sider, 96 sh. le [Internet]. 1963 Jan. 1 [cited 2025 Dec. 6];27. Available from: https://tidsskrift.dk/ledelseogerhvervsoekonomi/article/view/34062