1.
OPERACZ, Maciej, KENTZER, Andrzej and NOWACZYK, Łukasz. The content of nitrogen compounds in the Wel river in the light of the Nitrates Directive. Ecological Questions. Online. 30 October 2013. Vol. 15, no. 1, p. 23–29. [Accessed 18 July 2024]. DOI 10.12775/v10090-011-0031-6.