1. Anderson, R. (1999). United States life tables, 1997. National vital statistics reports 47 (28). Hyattsville, MD: National Center for Health Statistics.
2. Arias, E. (2004). United States life tables, 2001. National vital statistics reports 52 (14). Hyattsville, MD: National Center for Health Statistics. http://www.cdc.gov/nchs/data/nvsr/nvsr52/nvsr52_14.pdf.
3. Spurious regression in econometrics;Granger;Journal of Econometrics,1974
4. Greene, W. (1997). Econometric analysis (3rd ed.). Upper Saddle River, NJ: Prentice-Hall.
5. Johnston, J. (1984). Econometric methods (3rd ed.). New York: McGraw Hill.