AKMAN, V.; TEN HAGEN, P. J. W. The Power of Physical Representations. AI Magazine, [S. l.], v. 10, n. 3, p. 49, 1989. DOI: 10.1609/aimag.v10i3.756. Disponível em: https://ojs.aaai.org/aimagazine/index.php/aimagazine/article/view/756. Acesso em: 23 apr. 2024.