Understanding Students’ Explanations in Geometry Tutoring Octav Popescu author Vincent Aleven author Kenneth Koedinger author 2004-aug 23–aug 27 text COLING 2004: Proceedings of the 20th International Conference on Computational Linguistics COLING Geneva, Switzerland conference publication popescu-etal-2004-understanding https://aclanthology.org/C04-1196/ 2004-aug 23–aug 27 1339 1345