@misc{Viberg_Andreas_The_2015,
 author={Viberg, Andreas},
 volume={53},
 copyright={Creative Commons Attribution BY-SA 3.0 PL license},
 address={Warszawa},
 journal={Archaeologia Polona},
 howpublished={online},
 year={2015},
 publisher={Institute of Archaeology and Ethnology Polish Academy of Sciences},
 language={eng},
 type={Text},
 title={The Big Five. Mapping the subsurface of Iron Age forts on the Island of Öland, Sweden},
 URL={http://rcin.org.pl/Content/87065/PDF/WA308_92350_P357_The-Big-Five-Mapping.pdf},
 keywords={ring-fort, Iron Age, Öland, Sweden, ground-penetrating radar, MIRA, magnetometer},
}