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![Cover for Kerstin Helmes · Relationship U-Turn: Approaches to Increase the Value of an Unprofitable Customer (Pocketbok) [German edition] (2011)](https://imusic.b-cdn.net/images/item/original/599/9783863410599.jpg?kerstin-helmes-2011-relationship-u-turn-approaches-to-increase-the-value-of-an-unprofitable-customer-pocketbok&class=scaled&v=1408537692)