Higuchi et. al, "Catalysis of Anhydride Formation in Aqueous Solutions of Dicarboxylic Acids,", 1966

Higuchi et. al, "Catalysis of Anhydride Formation in Aqueous Solutions of Dicarboxylic Acids,", 1966, Box: 10, Folder: 59. Personal papers of Takeru Higuchi, PP 359. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/124483 Accessed December 25, 2025.