Higuchi et. al, "Electrometric Titration of Some Functional Groups,", 1950

Higuchi et. al, "Electrometric Titration of Some Functional Groups,", 1950, Box: 10, Folder: 115. Personal papers of Takeru Higuchi, PP 359. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/124539 Accessed December 25, 2025.