Resumen de Zero degrees
Ron Lancaster (ed. lit.), Brigitte Bentele (ed. lit.)
http://www.nctm.org/eresources/article_summary.asp?URI=MT2010-03-478a&from=B
Ron Lancaster (ed. lit.), Brigitte Bentele (ed. lit.)
http://www.nctm.org/eresources/article_summary.asp?URI=MT2010-03-478a&from=B
