Recent trends in nutrient concentrations in Estonian rivers as a response to large-scale changes in land-use intensity and life-stylesIital, Arvo; Pachel, Karin; Loigu, Enn; Pihlak, Margus; Leis, ÜlleJournal of environmental monitoring2010 / 1, p. 178-188 : ill https://pubs.rsc.org/en/content/articlelanding/2010/em/b912923e