1. https://www.statista.com/statistics/264982/world-boron-reserves-by-major-countries/ (accessed 13 May 2022).
2. http://www.etimine.com/boron-minerals/ (accessed 13 May 2022).
3. http://www.etimine.com/boron-in-the-world/ (accessed 13 May 2022).
4. C. Helvaci, in Encyclopedia of geology, 2nd ed., A. Elias, Scott, David Eds., Academic Press (2021).
5. S.-P. B. Powoe, V. Kromah, M. Jafari and S. Chehreh Chelgani, Minerals, 11, 318 (2021).