Periphyton changes over 20 years of chemical recovery of Lake Orta, Italy: differential response to perturbation of littoral and pelagic communities. J Limnol [Internet]. 2011 Aug. 1 [cited 2025 Jul. 2];70(2):177-85. Available from: https://www.jlimnol.it/jlimnol/article/view/jlimnol.2011.177