Small hydropower goes unchecked. Issue 5 (3rd June 2019) - Lange, Katharina; Wehrli, Bernhard; Åberg, Ulrika; Bätz, Nico; Brodersen, Jakob; Fischer, Manuel; Hermoso, Virgilio; Liermann, Cathy Reidy; Schmid, Martin; Wilmsmeier, Lisa; Weber, Christine