Higuchi et. al, "Sabadila Alkaloids. III. Chromographic Separation of the Water-Soluble Fraction. Isolation of a New Crystalline Alkaloid, Sabatine,", 1951, Box: 11, Folder: 91. Personal papers of Takeru Higuchi, PP 359. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/124725 Accessed January 17, 2025.