AUTHOR=Gupta Neal S. TITLE=Plant Biopolymer–Geopolymer: Organic Diagenesis and Kerogen Formation JOURNAL=Frontiers in Materials VOLUME=2 YEAR=2015 URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2015.00061 DOI=10.3389/fmats.2015.00061 ISSN=2296-8016