Silveira, M.S.; de Souza, C.S.; Barbosa, S.D.J (2001) Semiotic Engineering Contributions for Designing Online Help Systems. In: SIGDOC'2001 - ACM Conference on Systems Documentation, 2001, Santa Fé. Proceedings of SIGDOC 2001. New York : ACM Press, 2001
http://doi.acm.org/10.1145/501516.501523
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