Reference
Otto Wienhaus, Frank Zimmermann, Ernst Bäucker (2001): Localization of Manganese, Sulfure, Potassium and Magnesium in Needle Tissues of Spruce (Picea abies (L.) KARST.) in the Eastern Parts of Erzgebirge Mountains on Sites with different Magnesium Supply. – Phyton, Annales Rei Botanicae, Horn – 41_2: 179 - 202.