LATOWSKI, Karol. Professor Ludwik Frey – a researcher and popularizer. Biodiversity: Research and Conservation, [S. l.], v. 25, p. 7–11, 2012. DOI: 10.2478/v10119-012-0016-3. Disponível em: https://pressto.amu.edu.pl/index.php/biorc/article/view/v10119-012-0016-3. Acesso em: 30 jun. 2024.