Cultural Impacts on the Spread of Mobile Commerce: An International Comparison.
In: B. Unhelkar, editor, Handbook of Research on Mobile Business, edition 2, pages 245 - 259. IGI, Hershey, 2008.
R. Wagner and M. Klaus.
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Mobile Direct Marketing.
In: B. Unhelkar, editor, Handbook of Research on Mobile Business, edition 2, pages 269 - 281. IGI, Hershey, 2008.
R. Wagner and M. Klaus.
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Challenges and Examples of Mobile Direct Marketing.
Dahlhoff, D. and Mann, A. and Wagner, R., DMCC - Dialog Marketing Competence Center, 2008. Number 2.
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[BibTeX] 

The Spread of Mobile Commerce: An Inter-Cultural Comparison.
Dahlhoff, D. and Mann, A. and Wagner, R., DMCC - Dialog Marketing Competence Center, 2008. Number 4.
R. Wagner and M. Klaus.
[doi]  [BibTeX]