Olney, A. M. (2009). GnuTutor: An open source intelligent tutoring system. In Proceedings of the 14th International Conference on Artificial Intelligence in Education (pp.803).  Amsterdam: IOS Press. paper

Olney, A. M. (2009) GnuTutor. An Open Source Intelligent Tutoring. System Based on AutoTutor. In Proceedings of the 2009 AAAI Fall Symposium on Cognitive and Metacognitive Educational Systems, Washington, DC. 2009 presentation paper