D'Amore, Bruno and FandiƱo Pinilla , Martha Isabel and Santi, George and Sbaragli, Silvia (2012) Some current researches in progress on the meaning of mathematical objects and about relations between semiotics and didactic at the NRD of Bologna. In: Avgerin, EP and Gagatsis, Athanasios, (eds.) Research on Mathematical Education and Mathematics Applications. Rhodes, Greece: Mathamatics Education and Multimedia Laboratory, pp. 139-158. ISBN 978-960-93-3768-7