6[3]Ronald W.Kaiser.the long cycle in real estate[J].Journal of Real Estate Research,1997,P:233
7[4]Tae Yoon Kim,Kyong Joo Oh,Insuk Sohn,Changha Hwang.Usefulness of artificial neural networks for early warning system of economic crisis[J].Expert Systems with Applications,2004.
8[5]Juliana Yim,Heather Mitchell.(2005) Comparison of country risk models:hybrid neural networks,logit models,discriminant analysis and cluster techniques[J].Expert Systems with Applications,2005,28,137-148.
9[6]Witold Witkiwicz.The Use of the HP-filter in Constructing Real Estate Cycle Indicators[J].Journal of Real Estate Research,2002.
10[7]Karl E.Case.Real Estate and the Macro-economy,Brookings Papers on Economic Activity[J].2000.
