Mathematics Education and Language Diversity The 21st ICMI Study - Barwell, Richard; Clarkson, Philip; Halai, Anjum; Kazima, Mercy; Moschkovich, Judit; Planas, Núria; Setati-Phakeng, Mamokgethi; Valero, Paola; Villavicencio Ubillús, Martha (Springer International Publishing : Imprint: Springer, 2016)