Johnsen E. Churchman, Ackoff and Arnoff: Introduction to Operations Research. 645 sider, $ 12, John Wiley & Sons, Inc., 1957. le [Internet]. 1957 Jan. 1 [cited 2024 Jul. 18];21. Available from: https://tidsskrift.dk/ledelseogerhvervsoekonomi/article/view/33626