Higuchi and Guttman, "Possible Complex Formation Between Macromolecules and Certain Pharmaceuticals X, The Interaction of Some Phenolic Compounds with Polyethylene Glycols, Polypropylene Glycols, and Polyvinylpyrrolidone,", 1956, Box: 11, Folder: 56. Personal papers of Takeru Higuchi, PP 359. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/124690 Accessed January 02, 2025.