SZEGŐ, Dániel. A Modal Logical Approach for Developing XML Databases. Periodica Polytechnica Electrical Engineering, [S. l.], v. 50, n. 3-4, p. 223–240, 2006. Disponível em: https://pp.bme.hu/ee/article/view/904. Acesso em: 16 apr. 2025.