1. Bellman, R.E.: Equipment replacement policy. SIAM J. Appl. Math. 3, 133–136 (1955)
2. Buckley, J.: The fuzzy mathematics of finance. Fuzzy Sets Syst. 21, 257–273 (1987)
3. Buckley, J.: Solving fuzzy equations in economics and finance. Fuzzy Sets Syst. 48, 289–296 (1992)
4. Biswas, P., Pramanik, S.: Application of fuzzy ranking method to determine the replacement time for fuzzy replacement problem. Int. J. Comput. Appl. 25(11), 41–47 (2011)
5. Biswas, P., Pramanik, S.: Fuzzy approach to replacement problem with value of money changes with time. Int. J. Comput. Appl. 30(10), 28–33 (2011)