<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>47</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">G Psycharis</style></author></authors><secondary-authors><author><style face="normal" font="default" size="100%">A M Lindmeier</style></author><author><style face="normal" font="default" size="100%">A Heinze</style></author></secondary-authors></contributors><titles><title><style face="normal" font="default" size="100%">Abstraction through instrumentalization</style></title><secondary-title><style face="normal" font="default" size="100%">Proceedings of the 37th Conference of the International Group for the Psychology of Mathematics Education (PME 37), Research forum “Activity theoretical approaches to mathematics classroom practices with the use of technology”</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2013</style></year></dates><publisher><style face="normal" font="default" size="100%">PME</style></publisher><pub-location><style face="normal" font="default" size="100%">Kiel, Germany</style></pub-location><volume><style face="normal" font="default" size="100%">1</style></volume><pages><style face="normal" font="default" size="100%">192-196</style></pages><language><style face="normal" font="default" size="100%">eng</style></language></record></records></xml>