Higuchi et. al, "Interaction of Acetic Anhydride with Di- and Tri-carboxylic Acids with Glutaric Anhydride in Aqueous Solution,", 1966

Higuchi et. al, "Interaction of Acetic Anhydride with Di- and Tri-carboxylic Acids with Glutaric Anhydride in Aqueous Solution,", 1966, Box: 10, Folder: 172. Personal papers of Takeru Higuchi, PP 359. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/124596 Accessed December 25, 2025.