AUTHOR=Uchida Naoshige , Mainen Zachary F. TITLE=Odor concentration invariance by chemical ratio coding JOURNAL=Frontiers in Systems Neuroscience VOLUME=2 YEAR=2008 URL=https://www.frontiersin.org/journals/systems-neuroscience/articles/10.3389/neuro.06.003.2007 DOI=10.3389/neuro.06.003.2007 ISSN=1662-5137