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Elias S. Demas and Theofilos Alexandros Kyriakides. (1996). The Functions of Folk Dances in Epeiros and Their Relation to Contemporary Social Conditions in Hellas (Greece). Dance Chronicle, 19(1), 1–15. doi:10.2307/1567802 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research