Mežaka, Anna, et al. “Evaluation and Long-Term Conservation Perspectives of Woodland Key Habitat Bryophyte and Lichen Indicators in Latgale”. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference, vol. 2, June 2015, pp. 197-01, https://doi.org/10.17770/etr2015vol2.283.