Restoring migratory salmonid populations in regulated rivers in the northernmost Baltic Sea area, northern Finland - biological, technical and social challenges - Erkinaro, Jaakko; Laine, Anne; Mäki-Petäys, Aki; Karjalainen, Timo. P.; Laajala, Esa; Hirvonen, Arto; Orell, Panu; Yrjänä, Timo (My University, 2011)