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Herschy, R.W., Gergov (Deceased), G. (2012). Wetland Areas and Lakes in Bulgaria. In: Bengtsson, L., Herschy, R.W., Fairbridge, R.W. (eds) Encyclopedia of Lakes and Reservoirs. Encyclopedia of Earth Sciences Series. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-4410-6_186
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