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https://en.wikipedia.org/wiki/Barbus_balcanicus.
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http://www.fishbase.org/summary/Barbus-balcanicus.
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Bertoli, M., Pizzul, E., Devescovi, V., Franz, F., Pastorino, P., Giulianina,
P. G., Ferrari, C., and Marzano, F. N. (2019).
Biology and distribution of Danube barbel (Barbus
balcanicus) (Osteichthyes: Cyprinidae) at the Northwestern limit of
its range.
The European Zoological Journal, 86(1):280–293. doi:10.1080/24750263.2019.1647298.
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Kooijman, S. (2010).
Dynamic Energy Budget theory for metabolic organisation.
Cambridge Univ. Press, Cambridge.