| Citation: | LENG Tuo. Spectral Properties and Geometric Interpretation of R-Filters[J]. Applied Mathematics and Mechanics, 2009, 30(1): 109-119. | 
 
	                | [1] | Hodrick R J,Prescott E C, Postwar U S. Business cycles:an empirical investigation[J].Journal of Money,Credit,and Banking,1997,29(1):1-16. doi:  10.2307/2953682 | 
| [2] | Araujo Fabio, Areosa Marta Baltar Moreira, Neto Jose Alvaro Rodrigues.R-filters:a Hodrick-Prescott filter generalization[R]. Working Paper Series, 69,2003, 1-37. | 
| [3] | Ehlgen Jürgen.Distortionary effects of the optimal Hodrick-Prescott filter[J]. Economic Letters,1998, 61(3):345-349. doi:  10.1016/S0165-1765(98)00190-6 | 
| [4] | Razaak W. The Hodrick-Prescott technique:a smooler versus a filter. an application to New Zealand GDP[J].Economic Letters,1997,57(2):163-168. | 
| [5] | Cogly Timothy, Nason James M. Effects of the Hodrick-Prescott filter on trend and difference stationary time series. implication for business cycle research[J].Journal of Economic Dynamics and Control,1995,19(1/2):253-278. doi:  10.1016/0165-1889(93)00781-X | 
| [6] | King Robert G, Rebelo Sergio T.Low frequency filtering and real business cycles[J]. Journal of Economic Dynamics and Control,1993,17:207-231. | 
| [7] | Reeves J J, Blyth C A, Small J P.The Hodrick-Prescott filter, a generalization,and a new procedure for extracting an empirical cycle from series[J]. Studies in Nonlinear Dynamics and Economics,2000,4(1):1-16. doi:  10.1162/108118200569153 | 
| [8] | Baxter M, King Robert G. Measure business cycles approximate band-pass filters for economic time series[J].The Review of Economics and Statistics,1999,81(4):575-593. doi:  10.1162/003465399558454 | 
| [9] | Apel Mikael, Hansen Jan, Lindberg Hans. Potential output and output gap[J].Quarterly Review of the Bank of Sweden, 1996,3:24-35. | 
| [10] | Horn R, Johnson C R.Martrix Analysis[M].New York:Cambridge University Press, 1985. | 
