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GMM with weak identification
Stock, James H., (2000)
Small sample adjustments for the J-test
Godfrey, L. G., (1982)
Nonlinear adjustment, long-run equilibrium and exchange rate fundamentals
Taylor, Mark P., (2000)
Measuring inefficiency via potential improvements
Asmild, Mette, (2003)
Railway reforms : do they influence operating efficiency?
Asmild, Mette, (2008)
Railway Reforms : Do They Influence Operating Efficiency?