GUTERCH, Aleksander; JANIK, Tomasz. Professor Marek Grad (1951–2020) – An Outstanding Polish Geophysicist and Polar Researcher. Polish Polar Research, [S. l.], v. 41, n. 4, p. 315–316, 2020. DOI: 10.24425/ppr.2020.135372. Disponível em: https://wydawnictwo.pan.pl/index.php/ppr/article/view/3039. Acesso em: 1 sep. 2026.