Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) P.A. Levene and Leonard C. Kreider,OXIDATION AND HYDROLYSIS OF POLYGALACTURONIDE METHYL ESTER TO LEVO-TARTARIC ACID,Journal of Biological Chemistry,0021-9258,Elsevier BV,1937-09,120,2,591-595,https://cir.nii.ac.jp/crid/1361699995008227456,https://doi.org/10.1016/s0021-9258(18)45120-4