Sousa, Sttiwe Washington Ferreira de, Ed Porto Bezerra Bezerra, Ismênia Mangueira Soares Soares, and Edna Gusmão de Góes Brennand. " MARKER - a tool for building interactive applications for t-learning." Proceedings of the 19th Brazilian Symposium on Multimedia and the Web, Salvador, 2013. SBC, 2013, pp.281-284.