<?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%">Heeffer, Albrecht</style></author></authors><secondary-authors><author><style face="normal" font="default" size="100%">Van Kerkhove, Bart</style></author></secondary-authors></contributors><titles><title><style face="normal" font="default" size="100%">On the Nature and Origin of Algebraic Symbolism</style></title><secondary-title><style face="normal" font="default" size="100%">New Perspectives on Mathematical Practices. Essays in Philosophy and History of Mathematics.</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2009</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://www.worldscibooks.com/etextbook/6810/6810\_chap01.pdf</style></url></web-urls></urls><publisher><style face="normal" font="default" size="100%">World Scientific Publishing</style></publisher><isbn><style face="normal" font="default" size="100%">978-981-281-222-3</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language></record></records></xml>