GRUSZKA, Wojciech and LIPNICKI, Ludwik. Standard procedure for the identification of lichen refuges: a case study of the Krajeńskie Lakeland area in Poland. Ecological Questions. Online. 22 November 2019. Vol. 30, no. 4, pp. 19-27. [Accessed 30 June 2024]. DOI 10.12775/EQ.2019.025.