Higuchi et. al, "Acid Anhydride-Free Acid Equilibria in Water in Some Substituted Succinic Acid Systems and Their Interaction with Aniline,", 1967, Box: 10, Folder: 30. Personal papers of Takeru Higuchi, PP 359. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/124454 Accessed June 02, 2024.