versioning

• Bhargava, Hemant K. and Choudhary, Vidyanand
  Information Goods and Vertical Differentiation
  Journal of Management Information Systems
  Vol. 18 No. 2 , Fall 2001 , pp. 89 - 106

• Hui, Wendy , Yoo, Byungjoon and Tam, Kar Yan
  The Optimal Number of Versions: Why Does Goldilocks Pricing Work for Information Goods?
  Journal of Management Information Systems
  Vol. 24 No. 3 , Winter 2008 , pp. 167 - 191

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