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https://doi.org/10.1080/21580103.2015.1075435

2. Mäkinen, H., & Isomäki, A. (2004). Thinning intensity and long-term changes in increment and stem form of Norway spruce trees. Forest Ecology and Management, 201(2-3), 295-309.

https://doi.org/10.1016/j.foreco.2004.07.017

3. Juodvalkis, A., Kairiukstis, L., & Vasiliauskas, R. (2005). Effects of thinning on growth of six tree species in north-temperate forests of Lithuania. European Journal of Forest Research, 124(3), 187-192.

https://doi.org/10.1007/s10342-005-0070-x