Boreal Picea abies Mires of Finland: Cajanderian Site Types and Compositional Gradients in Relation to Species Richness. - Laitinen, Jarmo; Kaakinen, Eero; Oksanen, Jari; Saarimaa, Miia; Ruuhijärvi, Rauno (Annales Botanici Fennici, 2018)