AUTHOR=Chung Jacob N. TITLE=Grand Challenges in Bioenergy and Biofuel Research: Engineering and Technology Development, Environmental Impact, and Sustainability JOURNAL=Frontiers in Energy Research VOLUME=1 YEAR=2013 URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2013.00004 DOI=10.3389/fenrg.2013.00004 ISSN=2296-598X