Perna, Cristina Lopes, and Yuqi Sun. “Acquisition of Portuguese As an Additional Language (PLA): The Use of Hedges in Portuguese by Native Speakers of Mandarin”. Letras De Hoje, vol. 46, no. 3, Sept. 2011, pp. 59-70, https://revistaseletronicas.pucrs.br/fale/article/view/9745.