Higuchi et. al, "Effects of Salicylate on Rectal Absorption of Theophylline,", 1981

Higuchi et. al, "Effects of Salicylate on Rectal Absorption of Theophylline,", 1981, Box: 10, Folder: 110. Personal papers of Takeru Higuchi, PP 359. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/124534 Accessed December 25, 2025.