Thorsten Blecker Nizar Abdelkafi Gerold Kreutler Bernd Kaluza Auction-based Variety Formation and Steering for Mass Customization. 232-242 2004 14 Electronic Markets 3 http://dx.doi.org/10.1080/1019678042000245245 db/journals/electronicmarkets/electronicmarkets14.html#BleckerAKK04