TRACZYK, Wiesław. Structural representations of unstructured knowledge. Journal of Telecommunications and Information Technology, Warsaw, Poland, v. 21, n. 3, p. 81–86, 2005. DOI: 10.26636/jtit.2005.3.322. Disponível em: https://jtit.pl/jtit/article/view/322. Acesso em: 19 jun. 2026.