Retkocer
Retkocer is a village in the municipality of Medveđa, Serbia. According to the 2002 census, the village has a population of 96 people. Dušan Spasojević, known by the nicknames Duća and Šiptar, was the head of one of the largest Serbian criminal groups on record, the Zemun Clan. He was born and from Retkocer.