BENKŐ, Borbála Katalin; LÁNYI, Dávid. An open learning system. Periodica Polytechnica Electrical Engineering, [S. l.], v. 55, n. 1-2, p. 21–29, 2011. 10.3311/pp.ee.2011-1-2.03. Disponível em: https://pp.bme.hu/ee/article/view/2112. Acesso em: 24 dec. 2024.