TY - CHAP T1 - Towards a Flexible Intelligent Tutoring System for Argumentation AU - Loll, F. AU - Pinkwart, N. AU - Scheuer, O. AU - McLaren, B. M. TI - Proceedings of the 9th IEEE International Conference on Advanced Learning Technologies (ICALT) PY - 2009 PB - IEEE Computer Society Press ER -