1. G. Hesse, in L. S. Ettre, A. Zlatkis (editors), 75 Years of Chromatography: a Historical Dialogue. Elsevier, Amsterdam, 1979; pp.131–140.
2. The various standardized aluminum oxides were produced by the Max Woelm Co., Eschwege, Germany.
3. G. Hesse, R. Hagel, Chromatographia9, 62 (1976).
4. G. Hesse, Chemie58, 76 (1945).
5. G. Hesse, H. Kauth, R. Wächter, Z. Angew. Entomologie37, 239 (1955).