KIERCUL, Sylwia. Common locality of Asplenium ruta-muraria and Asplenium trichomanes (Aspleniaceae) in north-eastern Poland. Ecological Questions. Online. 23 September 2021. Vol. 32, no. 4, pp. 27-34. [Accessed 4 March 2025]. DOI 10.12775/EQ.2021.031.