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S. Petkova, Kanev E., Dimitrova I., Kisliakov D., Uzunova E., Fish pass functionality in relation to the dynamics of hydrological conditions in the upper course of the river Iskar (Case study), Journal of Ecological Engineering, Vol. 20, Issue 6, pp 66–72, 2019, DOI:10.12911/22998993/108918
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