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2. The Sectoral e-Business Watch (2008) The European e-Business Report 2008, 6th Synthesis Report of the Sectoral e-Business Watch, H. Selhofer, et al., Editors, Brussels.
3. Robey, D., G. Im, and J.D. Wareham (2008) Theoretical Foundations of Empirical Research on Interorganizational Systems: Assessing Past Contributions and Guiding Future Directions. Journal of the Association for Information Systems. 9(9): p. 497–518.
4. CEN/ISSS (2003) Report and Recommendations of CEN/ISSS e-Invoicing Focus Group on Standards and Developments on electronic invoicing relating to VAT Directive 2001/115/EC – Final, Brussels.
5. Fairchild, A. and R. Peterson (2003) Value Positions for Financial Institutions in Electronic Bill Presentment and Payment (EBPP), in Proceedings of the 36th Hawaii International Conference on System Sciences (HICSS'03) R. Sprague, Editor. p. 10.