Fuzzy relative importance ‎of ‎customer ‎requirements in Improving Product Development. In the Proceedings of the 5th IEEE, ISBN: 978-1-4673-5812-5 - Bencherif Fateh; Mouss Leila Hayet; Meguellati Mohamed (International ‎Conference on ‎Modelling, Simulation and Applied Optimization (ICMSAO IEEE) Hammamet, Tunisia, 2013)