AUTHOR=Fischer Martin H. , Shaki Samuel TITLE=Two steps to space for numbers JOURNAL=Frontiers in Psychology VOLUME=6 YEAR=2015 URL=https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2015.00612 DOI=10.3389/fpsyg.2015.00612 ISSN=1664-1078