1. buse.A (1992)    the bias of instrumental variable estimators
2. Jiahui Wang and Eric Zivot (1998)  Inference on Structural Parameters in Instrumental Variables Regression with Weak Instruments
3. Angrist, Joshua D., Imbens, Guido W. and Krueger, Alan B(1999)Jackknife Instrumental Variables Estimation
4. Small sample properties of LIML and jackknife IV estimators: experiments with weak instruments
Sören Blomquist *, Matz Dahlberg
5. Stephen G. Donald and Whitney K. Newey (2001)Choosing the Number of Instruments
6. Jinyong Hahn and Jerry Hausman(2002) A New Specification Test for the Validity of Instrumental Variables