Pietrasz, K.; Sikora, D.; Chodkiewicz, T.; Ślęzak, M.; Woźniak, B. Keystone Role of Eurasian Beaver Castor Fiber in Creating the Suitable Habitat over the Core Breeding Range for Forest Specialist Species the Three-Toed Woodpecker Picoides Tridactylus. BALT FOR 2019, 25, 223-227.