Cho and Pitman, "Linear Free Energy Relationships Governing the Covalent Addition of Nucleophilic Reagents to a Nitrogen-Containing Heteroaromatic Molecule,", 1974, Box: 11, Folder: 138. Personal papers of Takeru Higuchi, PP 359. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/124772 Accessed October 12, 2024.