X. Liu, and J. Yen. ICSE '96: Proceedings of the 18th international conference on Software engineering, page 60--69. Washington, DC, USA, IEEE Computer Society, (1996)
M. Strohmaier, P. Prettenhofer, and M. Lux. CSKGOI'08 International Workshop on Commonsense Knowledge and Goal Oriented Interfaces, in conjunction with IUI'08, Canary Islands, Spain, (2008)