9Haenlein M, Kaplan A M, Schoder D.Valuing the real option of abandoning unprofitable customers when calculating customer lifetime value[J].Journal of Marketing, 2006,70( 3 ).
10Khajvand M, Zolfaghar K, Ashoori S, et al.Estimating customer lifetime value based on RFM analysis of customer purchase behavior: Case study[J].Procedia Computer Science, 2011, 3.