Remm, Liina, Mihkel Rünkla, and Asko Lõhmus. 2018. “How Bilberry Pickers Use Estonian Forests: Implications for Sustaining a Non-Timber Value”. Baltic Forestry 24 (2):287-95. https://balticforestryojs.lammc.lt/ojs/index.php/BF/article/view/348.