1Chen Youjun, Wei Yong. Applications of Grey Relative Relational Grade to Optimization of Grey Model (1,1) [J]. The Journal of Grey System. 2007.4.321 - 332.
8Wang Ruimin,Wei Yong.Optimization of Albinism Differential Equation Parameter of Non-equal Interval GM (1,1) Model [J]. Journal of System Science and Information , 2012,10 (4) : 295-301.