5Liu Si - feng, Deng Ju- long, The Range Suitable for GM(1,1) [J]. The Journal of Grey System(UK). 1999, 11(1):131 - 138.
6Liu Si - feng, Lin Yi. An introduction to Grey systems:Foundation, Methodology and Applications [ M ]. Slippery rock, Ⅱ GSS Aeadende publisher, 1998.
7Dang Yaoguo, Liu Sifeng, Chert Kejia. The GM model, that x(n) be taken as initial value[J]. Journal of XiaMen University(Natural Science). 2002,41(Sup. ) : 276 - 277.
8Liu Sifeng, Forrest. J. The role and position of Grey system theory in science development[J]. The Journal of Grey System(UK). 1997,9(4) -351 - 356.
9Deng Ju Long, Iutroduction to Grey system Theory[J ]. The Journal of Grey System(UK). 1989,1( 1 ) : 1 - 24.
10Yi Lin, Sifeng Liu. A systemic analysis with data (Ⅰ)[J]. International Journal of General Systems(UK), 2000,29(6): 989-999.
