1.
Ptak M. Lake Evolution in the Żnin Region in the Years 1912– 1960 (Central Poland). qg [Internet]. 2013 Feb. 23 [cited 2024 Jul. 17];32(1):21-6. Available from: https://pressto.amu.edu.pl/index.php/qg/article/view/quageo-2013-0003