Johnsen, E. (1964). C. Jackson Grayson, Jr., Decisions Under Uncertainty Drilling Decisions by Oil and Gas Operators, Harvard Business School, Boston, 1960, 402 s., Dollars. Ledelse Og Erhvervsøkonomi, 28. Hentet fra https://tidsskrift.dk/ledelseogerhvervsoekonomi/article/view/34191