Medieval settlements in the Virovitica Region of the Drava River Basin in the period from the 7th to the 11th centuries - Sekelj Ivančan, Tajana (Srednji vek : Arheološke raziskave med Jadranskim morjem in Panonsko nižino. Mittelalter. Archäologische Forschungen zwischen der Adria und der Pannonischen Tiefebene., 2008)