Tsagaan, B., Ganbaatar, O., Darizav, T. and Byambaa, K. 2020. Content and distribution of some chemical elements in the poplar leaves (Populus laurifolia) in Ulaanbaatar. Proceedings of the Mongolian Academy of Sciences. 60, 4 (Dec. 2020), 18–27. DOI:https://doi.org/10.5564/pmas.v60i4.1502.