1. Schweingruber, F. H. in Climate from Tree Rings (eds Hughes, M. K., Kelly, P.M., Pilcher, J. R. & LaMarche, V. C.) 8–12 (Cambridge University Press, 1982).
2. Lenz, O., Schär, E. & Schweingruber, F. H. Holzforschung 30, 114–123 (1976).
3. Fritts, H. C. Tree Rings and Climate (Academic, London, 1976).
4. Wigley, T. M. L., Briffa, K. R. & Jones, P. D. J. Climate appl. Met. (in the press).
5. Mossman, R. C. Trans. R. Soc. Edinb., 38, 681–755 (1896); 39, 63–207 (1897); 40, 406–509 (1902).