Ts, B., B, K., G, O., E, V. I., V, S. E., D, T., & T, K. A. (2018). BACKGROUND CONCENTRATION OF MICROELEMENTS IN ULAANBAATAR REGIONAL NATURAL SURFACE SOIL. Proceedings of the Mongolian Academy of Sciences, 58(2), 15–24. https://doi.org/10.5564/pmas.v58i2.1001