Kolmykov, Roman P. “Determination of Boron, Lithium and Some Metals in Fly Ash by Laser Ablation ‒ Inductively Coupled Plasma ‒ Optical Emission Spectrometry”. Eurasian Chemico-Technological Journal 24, no. 2 (July 25, 2022): 123–129. Accessed April 25, 2024. https://ect-journal.kz/index.php/ectj/article/view/1324.