1. Bergner, P.-E.E.: Exchangeable mass: determination without assumption of isotopic equilibrium. Science 150, 1048–1050 (1965)
2. Brantseg, A.: A fertilizer experiment in a Scots pine forest. Medd. norske Skogsforsøksv. 17(3), 239–288 (1962)
3. Brix, H.: Effects of nitrogen fertilization on photosynthesis and respiration in Douglas-fir. Forest Sci. 17, 407–414 (1971)
4. Eklund, B.: Variation in the widths of the annual rings in pine and spruce due to climatic conditions in northern Sweden during the years 1900–1944. Medd. fr. Stat. Skogsforskn.-inst. 44(8), 140–150 (1954)
5. Fritts, H.C.: Relationsships of ring widths in arid-site conifers to variations in monthly temperature and precipitation. Ecol. Mon. 44, 411–440 (1974)