J. Gluz, T. Cabral, P. Baggio, and P. Livi.
" Helping students of introductory calculus classes: the Leibniz pedagogical agent", in Proceedings of the 1st Workshop-School on Agents, Environments, and Applications, Pelotas/RS, 2007, pp. 51-64, doi: https://doi.org/10.5753/wesaac.2007.33034.