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Lousada, M., Jesus, L.M.T., Capelas, S., Margaca, C., Simoes, D., Valente, A., Hall, A. and Joffe, V. (2013). Phonological and articulation treatment approaches in Portuguese children with speech and language impairments: a randomized controlled intervention study. International Journal of Language and Communication Disorders, 48(2), pp. 172-187. doi: 10.1111/j.1460-6984.2012.00191.x