{"id":"001052023","type":"book","title":"Jómsvikingalog, Jómsvikings, Jomsborg/Wolin and Danish circular strongholds","publisher":"Scientia","publisher-place":"Warsaw","pages":"49-61","container-title":"The neighbours of Poland in the 10th century","author":[{"family":"Słupecki","given":"Leszek P."}],"issued":{"raw":"2000"}}