1. Arevalo, R. (2018). Potassium. In M. V. White et al. (Eds.), Encyclopedia of Geochemistry. Springer.
2. Blebea-Apostu, A. M., Margineanu, R. M., Duliu, O. G., et al. (2023). 137Cs distribution on the territory of Romania 30 years after Chernobyl accident. Environmental Monitoring and Assessment, 195, 848. https://doi.org/10.1007/s10661-023-11441-0
3. Beretka, J., & Matthew, P. J. (1985). Natural radioactivity of Australian building materials, industrial wastes and by-products. Health Physics, 48, 87–95. https://doi.org/10.1097/00004032-198501000-00007
4. Blum, W. E. H., Schad, P., & Nortcliff, S. (2018). Essentials of soil science. Borntraeger Science Publishers.
5. Burrough, P. A., McDonnell, R. A., & Lloyd, C. D. (2015). Principles of geographical information systems. Oxford University Press.