2Perkowitz M., Etzioni O. Towards adaptive web sites: Conceptual framework and case study [J]. Artificial Intelligence, 2000, 118(1): 245-275.
3Banker, D. R., Charnes, A., & Cooper, W. W. Some models for estimating technical and scale inefficiencies in data envelopment analysis [J]. Management Science, 2002, 3(2): 178-192.