Higuchi and Rasmussen, "Spectropolarimetric and Circular Dichroism Methods for Determining the Activity of Penicillin,", 1971, Box: 11, Folder: 111. Personal papers of Takeru Higuchi, PP 359. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/124745 Accessed June 16, 2024.