Stafilov, Trajče. 1994. “Corrections of the Methods for Manganese Determination in Waste Waters by UV-VIS Spectrophotometry and Atomic Absorption Spectrometry and Investigation of the Possibility for Its Precipitation”. Macedonian Journal of Ecology and Environment 2 (1):91-99. https://mjee.org.mk/index.php/mjee/article/view/19.