Hauke-Kowalska, Maria, Elżbieta Borowiak, Władysław Barzdajn, Wojciech Kowalkwski, Robert Korzeniewicz, and Tomasz Wawro. 2019. “Cone and Seeds Variability in Seed Orchards and Seed Stands of Pinus Sylvestris L”. Baltic Forestry 25 (2):187-92. https://doi.org/10.46490/vol25iss2pp187.