Z. Zhang

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Zhang, Z., Haffner, E., Heuer, A., Engel, T., Meinel, Ch. (1999): Role-Based Access Control in Online Authoring and Publishing Systems vs. Document Hierarch. In: ACM 17th International Conference on Systems Documentation , 1999, . pp. 193-198. http://www.acm.org/pubs/articles/proceedings/doc/318372/p193-zhang/p193-zhang.pdf

Zhang, Z., Haegen, F. Van Der, Polet, Philippe (2003): A systematic barrier removal methodology: application for transportation system. In: Stephanidis, Constantine (eds.) Proceedings of the Tenth International Conference on Human-Computer Interaction June 22-27, 2003, Crete, Greece. pp. 622-628.