Higuchi et. al, "Chromatographic Separation and Determination of Mixtures of -Hydroxybenzoate Esters", 1952

Higuchi et. al, "Chromatographic Separation and Determination of Mixtures of p-Hydroxybenzoate Esters", 1952, Box: 10, Folder: 67. Personal papers of Takeru Higuchi, PP 359. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/124491 Accessed December 25, 2025.