AUTHOR=Agrillo Christian TITLE=One vs. two non-symbolic numerical systems? Looking to the ATOM theory for clues to the mystery JOURNAL=Frontiers in Human Neuroscience VOLUME=7 YEAR=2013 URL=https://www.frontiersin.org/journals/human-neuroscience/articles/10.3389/fnhum.2013.00073 DOI=10.3389/fnhum.2013.00073 ISSN=1662-5161