1. P. B. Cyril, Smith, G. E., Ancient Egyptian medicine : the Papyrus Ebers, 3rd ed., 1974.
2. Chemical observations and experiments on air and fire;Scheele;J. Johnson,1780
3. Microporous Framework Solids;Wright;Royal Soc. Chem.,2007
4. H. S. C. Deville, Reproduction de la Lévyne, 1862.
5. Richard Maling Barrer. 16 June 1910–12 September 1996