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Halbheer, D; Stahl, F; Koenigsberg, O; Lehmann, D R (2010). Sampling Information Goods: How much Should be Free? In: INFORMS Marketing Science Conference 2010, Cologne, Germany, 16 June 2010 - 19 June 2010.
Stahl, F; Heitmann, M; Lehmann, D R (2010). The Impact of Customer-Based Brand Equity on Customer Acquisition and Customer Retention. In: 39th EMAC Conference, Copenhagen, 1 June 2010 - 4 June 2010.