@misc{Potrykowski_Marek_Main,
 author={Potrykowski, Marek and Kulikowski, Roman and Łoboda, Jan and Maik, Wiesław and Potrykowska, Alina and Rykiel, Zbigniew and Stryjakiewicz, Tadeusz.},
 howpublished={online},
 title={Main problems, research results and functions of Polish socioeconomic geography.},
}