@misc{Eberhardt_Piotr_(1935–2020)_Podstawy_2012, author={Eberhardt, Piotr (1935–2020)}, volume={84}, number={2}, copyright={Rights Reserved - Free Access}, address={Warszawa}, journal={Przegląd Geograficzny}, howpublished={online}, year={2012}, publisher={IGiPZ PAN}, language={pol}, type={Text}, title={Podstawy teoretyczne i ideowe geopolityki według Rudolfa Kjelléna = The theoretical and ideological foundations of geopolitics according to Rudolf Kjellén}, URL={http://www.rcin.org.pl/Content/12724/PDF/WA51_22380_r2012-t84-z2_Przeglad-Geogr-Eberhardt.pdf}, }