1. Greene, W.H. (2000) Econometric Analysis, 4th ed., Prentice Hall, Upper Saddle River, NJ.
2. Cameron, A.C. and Trivedi, P.K. (2005) Microeconometrics: Methods and Applications, Cambridge University Press, New York.
3. Le, C.T. (1997) Applied Survival Analysis, John Wiley & Sons, Inc., New York.
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