S. Moraes and R. Machado. " Chatterbot for Education: a Study based on Formal Concept Analysis for Instructional Material Recommendation", in Anais do XXVII Simpósio Brasileiro de Informática na Educação, Uberlândia/MG, 2016, pp. 1347-1351, doi: https://doi.org/10.5753/cbie.sbie.2016.1347.