Higuchi and Repta, "Quantitative Analysis of Microgram Quantities of Pilocarpine in Aqueous Solution,", 1971, Box: 11, Folder: 69. Personal papers of Takeru Higuchi, PP 359. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/124703 Accessed January 02, 2025.