1. Abberger, K. (2004) Nonparametric regression and the detection of turning points in the Ifo business climate. ESifo Working Paper Nr. 1238
2. Abberger, K. (2005) Another look at the ifo business cycle clock. Journal of Business Cycle Measurement and Analysis 2, 431–443
3. Abberger, K. (2006) Qualitative business surveys in manufacturing and industrial production – What can be learned from industry branch results. Ifo Working Paper Nr. 31
4. Abberger, K. (2007a) The use of qualitative business tendency surveys for forecasting business investment in Germany. Forecasting Letters, in press
5. Abberger, K. (2007b) Qualitative business surveys and the assessment of employment: A case study for Germany. International Journal of Forecasting, in press