Agnese Kukela. "ANCIENT STONE CIRCLES IN THE NORTHERN POLAND." SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 18th International Multidisciplinary Scientific GeoConference SGEM2018, Informatics, Geoinformatics and Remote Sensing (2018): 315-320. https://doi.org/10.5593/sgem2018/2.3/s11.040