1. (1)Karsak, E.E. and Ozogul, C.O., Valuation of expansion flexibility in flexible manufacturing system investments using sequential exchange options, International Journal of Systems Science, No. 36 (2005), pp. 243-253.
2. (2)Brennan, M.J. and Schwartz, S.E., Evaluating Natural Resource Investments, Journal of Business, No. 58 (1985), pp. 135-157.
3. (3)Dixit, A.K. and Pindyck, R.S., Investment under uncertainty, (1994), Princeton University Press, Princeton New Jersey.
4. (4)Luehrman, T.A., Investment opportunities as real options: getting started on the numbers, Harvard Business Review, No. 76 (1998), pp. 51-67.
5. (5)Mechlin, G.F. and Berg, D., Evaluating research- ROI is not enough, Harvard Business Review, No. 58 (1980), pp. 93-99.