STEREŃCZAK, Krzysztof and BĘDKOWSKI, Krzysztof. Assessment of the Scots pine (Pinus sylvestris L.) crowns density based on multispectral images obtained by unmanned aerial vehicle. Ecological Questions. Online. 17 July 2013. Vol. 17, p. 89 – 99. [Accessed 26 March 2026]. DOI 10.12775/ecoq-2013-0019.