Higuchi et. al, "Formation of Molecular Complexes by Diketobenzodiazines and their Methylated Derivatives with Phenol and Dihydroxybenzenes in Aqueous Solutions,", 1961, Box: 10, Folder: 141. Personal papers of Takeru Higuchi, PP 359. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/124565 Accessed May 18, 2024.