Leopold Gmelin (1848). Hand-book of chemistry. Vol. 15. Translated by Henry Watts. London: Cavendish Society. pp. 161–162. OCLC14840730 – via Google Books.
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Leopold Gmelin (1848). Hand-book of chemistry. Vol. 15. Translated by Henry Watts. London: Cavendish Society. pp. 161–162. OCLC14840730 – via Google Books.