USOLTSEV, Vladimir, ZUKOW, Walery and TSEPORDEY, Ivan. The needle percentage in the leafy shoot biomass of Scots pine in climate gradients of Eurasia. Journal of Education, Health and Sport. Online. 31 May 2022. Vol. 12, no. 5, pp. 416-428. [Accessed 6 July 2025]. DOI 10.12775/JEHS.2022.12.05.033.