daoud, R. , Amine, A. , Bouikhalene, B. , Lbibb, R.. "Customer Segmentation Model in E-commerce Using Clustering Techniques and LRFM Model: The Case of Online Stores in Morocco". World Academy of Science, Engineering and Technology, Open Science Index 104, International Journal of Computer and Information Engineering, (2015), 9(8), 2000 - 2010.