@ARTICLE{Guterch_Aleksander_Professor_2020, author={Guterch, Aleksander and Janik, Tomasz}, volume={vol. 41}, number={No 4}, journal={Polish Polar Research}, pages={315-316}, howpublished={online}, year={2020}, publisher={Polish Academy of Sciences}, publisher={Committee on Polar Research}, type={Nécrologie / Obituary}, title={Professor Marek Grad (1951–2020) an outstanding Polish geophysicist and polar researcher}, URL={http://ochroma.man.poznan.pl/Content/118351/PDF/2020-04-PPR-03-in-memoriam.pdf}, doi={10.24425/ppr.2020.135372}, }