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2. Abundance of elements in the earth's crust and in the sea, W. M. Haynes (Ed.), CRC Handbook of Chemistry and Physics, 97th ed., 2016–2017, CRC Press. Also see https://www.britannica.com/science/fluorine and https://www.britannica.com/science/chlorine for the latest update.
3. Fluorine in the Earth and the solar system, where does it come from and can it be found?;Koga;C. R. Chimie,2018
4. Organic synthesis – where now;Seebach;Angew. Chem., Int. Ed.,1990
5. "Fluorine";Kirsch,2004