K. Anstey, H. Mack, and N. Cherbuin. The American Journal of Geriatric Psychiatry: Official Journal of the American Association for Geriatric Psychiatry, 17 (7):
542--555(July 2009)PMID: 19546653.
J. Vig, S. Sen, and J. Riedl. IUI '09: Proceedings of the 13th international conference on Intelligent user interfaces, page 47--56. New York, NY, USA, ACM, (2008)
U. Schade, and H. Eikmeyer. Computerlinguistik: Was geht, was kommt? / Computational Linguistics: Achievements and Perspectives, volume 4 of Sprachwissenschaft, Computerlinguistik und Neue Medien, gardez!, (2002)
M. Kolp, P. Giorgini, and J. Mylopoulos. Eighth International Workshop on Agent Theories, Architectures, and Languages (ATAL-2001), Seattle, WA, (August 2001)