Nitrogen content and trends in agricultural catchments in EstoniaIital, Arvo; Klõga, Marija; Pihlak, Margus; Pachel, Karin; Zahharov, Andre; Loigu, EnnAgriculture, ecosystems and environment2014 / p. 44-53 : ill https://doi.org/10.1016/j.agee.2014.03.010 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS