1. Alonso G, Fiedler U, Hagen C, Lazcano A, Schuldt H, Weiler N. WISE: business to business e-commerce. Procs. 9th International Workshop on Research Issues on Data Engineering: Information Technology for Virtual Enterprises. Australia. 1999.
2. Angelov S, Grefen P. A conceptual framework for B2B electronic contracting. Procs. 3rd IFIP Working Conference on Infrastructures for Virtual Enterprises. Portugal. 2002 (a).
3. Angelov S, Grefen P. An approach for flexible B2B e-contracting process modeling. Twente University: CTIT Technical Report. 2002(b).
http://www.ctit.utwente.nl/publications/Tr01/
/publications/Tr01/.
4. Angelov S, Grefen P. A framework for the analysis of B2B electronic contracting support. Procs. 4th Edispuut Conference - Multidisciplinary Perspectives on Electronic Commerce. 2001(a).
5. Angelov S, Grefen P. B2B eContract handling - a survey of projects, papers and standards. Twente University: CTIT Technical Report 01–21. 2001(b).