AUTHOR=Zhang Qiuyun , Ling Dan , Lei Dandan , Wang Jialu , Liu Xiaofang , Zhang Yutao , Ma Peihua TITLE=Corrigendum: Green and Facile Synthesis of Metal-Organic Framework Cu-BTC-Supported Sn (II)-Substituted Keggin Heteropoly Composites as an Esterification Nanocatalyst for Biodiesel Production JOURNAL=Frontiers in Chemistry VOLUME=8 YEAR=2020 URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2020.00292 DOI=10.3389/fchem.2020.00292 ISSN=2296-2646