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Article
Dowling, Michael and Witte, Eberhard (1991) Value Added Services: Regulation and Reality in the United States. Telecommunications Policy 15 (6), pp. 509-518.
Witte, Eberhard and Dowling, Michael (1991) Value Added Services: Regulation and Reality in the Federal Republic of Germany. Telecommunications Policy 15 (5), pp. 437-452.