Bardarov, K. and Yordanova, T. (2026) “Fast and Reliable Determination of Alkali and Alkaline-earth Elements in Biological Fluids Using Laser-induced Breakdown Spectroscopy”, Proceedings of the Bulgarian Academy of Sciences. Sofia, Bulgaria, 79(7), pp. 871–880. doi: 10.7546/CRABS.2026.07.03.