Teirumnieks, Edmunds, Ērika Teirumnieka, Ilmārs Kangro, and Harijs Kalis. 2015. “THE MATHEMATICAL MODELING OF METALS CONTENT IN PEAT”. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 1 (August): 249-57. https://doi.org/10.17770/etr2009vol1.1119.