Higuchi and Repta, "Synthesis, Isolation, and Some Chemistry, of Citric Acid Anhydride,", 1969, Box: 11, Folder: 127. Personal papers of Takeru Higuchi, PP 359. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/124761 Accessed December 21, 2024.