F. Sturm, and P. Wolf. 2, page 1169-1174. Vienna, Austria, Amsterdam: IOS Press, (2004)eAdoption and the Knowledge Economy: Issues, Applications, Case Studies (Proc. eChallenges e-2004 Conference).
C. Aggarwal, J. Wolf, K. Wu, and P. Yu. KDD '99: Proceedings of the fifth ACM SIGKDD international conference on Knowledge discovery and data mining, page 201--212. New York, NY, USA, ACM Press, (1999)
K. Johnson, J. Boberski, L. Brendel, and D. Wolf. Abstract Book of the XXIII IUPAP International Conference on Statistical Physics, Genova, Italy, (9-13 July 2007)
W. Schaefer, and A. Wolf. 7th International Conference on Knowledge Engineering and Software Engineering, Rockville, Knowledge Systems Inst, pp 454--463, (1995)