Retkocer () is a village in the municipality of MedveÃÂa, Serbia. According to the 2002 census, the village has a population of 96 people. Duà ¡an Spasojevià(Cyrillic: ÃÂÃÂÃÂðý áÿðÃÂþÃÂõòøÃÂ; 10 July 1968 â 27 March 2003), known by the nicknames DuÃÂa and à  iptar, was the head of one of the largest Serbian criminal groups on record, the Zemun Clan. He was born and from Retkocer.