6Christian Hennig C. Identifiablity of models for clusterwise linear regression[J]. Journal of Classification, 2000, 17: 273-297.
7DeSarbo Wayne S, Cron W. L. A maximum likelihood methodology for clusterwise linear regresion[J]. Journal of Classification, 1988, 5: 249-282.
8Fornell Claes, Johnson Michael D, et al. The American customer satisfaction index: nature, purpose, and findings[J]. Journal of Marketing, 1996, 60:7-19.
9Nunnally, J. C. Psychometric Theory[M]. New York:McGraw Hill, 1978.
10Smith, Wendell. Product Differentiation and Market Segmentation as Alternative Marketing Strategies[J]. Journal of Marketing, 1956, 7: 3-8.