Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Waseda Amane,Carbon isotope geochemistry on natural gases in Japan,Researches in Organic Geochemistry,13449915,The Japanese Association of Organic Geochemists,2010,26,0,3-12,https://cir.nii.ac.jp/crid/1390282680389365760,https://doi.org/10.20612/rog.26.0_3