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Steiner, Winfried and Belitz, C and Lang, S (2006) Semiparametric Stepwise Regression to Estimate Sales Promotion Effects. In: Spiliopoulou, Myra, (ed.) From data and information analysis to knowledge engineering: proceedings of the 29th Annual Conference of the Gesellschaft für Klassifikation e.V., University of Magdeburg, March 9 - 11, 2005. Studies in classification, data analysis, and knowledge organization. Springer, Berlin, pp. 590-597. ISBN 3-540-31313-3.