Haemus Mons (English Wikipedia)

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Gordana Bjeletić (6 November 2018). "Protest protiv MHE, meštani Rakite vratili reku u korito" [Protest against micro hydro, denizens of Rakita returned river to its riverbed] (in Serbian). N1. Archived from the original on 16 November 2018. Retrieved 29 December 2018.
Beta (23 October 2018). "Trivan: Trenutni zakon dozvolio MHE u zaštićenim prostorima" [Current law allows for the micro hydros to be built in the protected areas] (in Serbian). N1. Archived from the original on 6 November 2018. Retrieved 23 October 2018.

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"Balkhan Mountains". World Land Features Database. Land.WorldCityDB.com. Archived from the original on 28 February 2008. Retrieved 31 March 2008.

Park prirode Stara Planina (PDF). Institute for nature conservation of Serbia. 2016. Archived from the original (PDF) on 2016-12-28. Retrieved 2017-06-19.