X. Wu, L. Zhang, и Y. Yu. WWW '06: Proceedings of the 15th international conference on World Wide Web, стр. 417--426. New York, NY, USA, ACM Press, (2006)
R. Sangüesa, и J. Pujol. Proceedings of the Workshop on Organizational Memories and Knowledge Management, International Joint Conference on Artificial Intelligence (IJCAI-01), стр. 85-93. (2001)