VDOVJAK, R. .; FRASINCAR, F. .; HOUBEN, G. .; BARNA, . P. . Engineering Semantic Web Information Systems in Hera. Journal of Web Engineering, [S. l.], v. 2, n. 1-2, p. 003–026, 2004. Disponível em: https://journals.riverpublishers.com/index.php/JWE/article/view/4373. Acesso em: 14 may. 2026.