Reference

G. Stecher, F. Schwienbacher, Stefan Mayr, Helmut Bauer (1999): Effects of Winter-Stress on Photosynthesis and Antioxidants of Exposed and Shaded Needles of Picea abies (L.) Karst. And Picea cembra L.. – Phyton, Annales Rei Botanicae, Horn – 39_4: 205 - 211.