@inproceedings{inproceedings78a7925a,
title   = {Some issues on learning mathematics through intelligent tutoring systems},
author = {Nunes, Maria das Graças Volpe and Mendes, Maria Dolores Ceccato and Andreucci, C A},
year = {1993},
publisher = {Heriot Watt University},
booktitle   = {International Peg Conference}
}