综述，介绍weak iv的有偏性、渐进性质、robust统计推断、检验方法等
Stock，Yogo，Wright， 1997，A Survey of Weak Instruments and Weak Identification in Generalized Method of Moments

weak iv的渐进性质，经典
Douglas Staiger and James H. Stock  1997 ，Instrumental Variables Regression with Weak Instruments，econometrica

目前检验weak iv的（据我所知）唯一量化方法
Stock and Yogo，Testing for Weak Instruments in Linear IV Regression