Kleibergen, F. and Mavroeidis, S. (2009). Weak instrument robust tests in GMM and the new Keynesian Phillips curve Journal of Business and Economic Statistics, 27(3):293--311.
Francesco Lippi (2009). Technological change and the households' demand for currency Journal of Monetary Economics.
Francesco Lippi (2009). Financial innovation and the transactions demand for cash Econometrica.