1. Abramowitz, M. and Stegun, I. A., 1965, Handbook of Mathematical Functions, Dover Publications, New York.
2. Abrams, M. D., Ruffuer, M. C., and Morgan, T. A., 1998, ‘Tree-ring responses to drought across species and contrasting sites in the ridge and valley of central Pennsylvania’, Forest Science 44, 550–558.
3. Alexandersson, H., 1986, ‘A homogeneity test applied to precipitation data’, Journal of Climatology 6, 661–675.
4. Alexandersson, H. and Moberg, A., 1997, ‘Homogenization of Swedish temeperature data. Part I: Homogeneity test for lineal trends’, International Journal of Climatology 17, 25–34.
5. Alley, W. M., 1984, ‘The Palmer drought severity index: Limitations and applications’, Journal of Applied Meteorology 23, 1100–1109.