6copas,J.B.and H.G..Li,inference for non-random sample(with discussion),Journal of the Royal statiseal socity 1997,(59):55 -95.
7Bayes,W.J.,Hoffman,D.L.,Low,S.A,.,An econometric analysis of the bank credit scoring problem[J],Journal of Econometric Perspectives,1989,VOI.40,No.2:3 -14.
10Takaho O, Yasuski T, Takazo K. Properties of Core in Quasi- particle Required for Large Amounts Usage of Limonitic Oresin Iron Ore Sintering Process[J]. ISIJ International, 2005,45 (4):532.