European wild forest reindeer and wolves: endangered prey and predators. - Kojola, Ilpo; Tuomivaara, Johanna; Heikkinen, Samuli; Heikura, Kalevi; Kilpeläinen, Kauko; Keränen, Jukka; Paasivaara, Antti; Ruusila, Vesa (Finnish Zoological and Botanical Publishing Board, 2009)