Nádaská, Gabriela, Kristína Polčová, and Juraj Lesný. “Manganese Fractionation Analysis in Specific Soil and Sediment Samples”. Nova Biotechnologica et Chimica 9, no. 3 (September 2, 2021): 295-301. Accessed December 7, 2021. https://journals.scicell.org/index.php/NBC/article/view/1138.