As of 1 April 2026, the PSJD database will become an archive and will no longer accept new data. Current publications from Polish scientific journals are available through the Library of Science: https://bibliotekanauki.pl
Comparison of select parameters of mallard (Anas platyrhynchos) popullation in urban and rural areas in the vicinity of Lublin Porównanie wybranych parametrów populacji krzyżówki Anas platyrhynchos na terenie miejskim i rolniczym okolic Lublina