F. da Silva and J. Maia.
"Luppar: An Information Retrieval System for Closed Document Collections", in <em>Anais do XV Encontro Nacional de Inteligência Artificial e Computacional</em>, São Paulo, 2018, pp. 912-923, doi: <a href="https://doi.org/10.5753/eniac.2018.4478">https://doi.org/10.5753/eniac.2018.4478</a>.