References
- Simonoff, J. (1996). Smoothing Methods in Statistics. Springer, New York, NY.
- S-PLUS 2000 Modern Statistics and Advanced Graphics (1999). Guide to Statistics, Volume 1 MathSoft, Seattle, WA.
- Venables, W. N. and Ripley, B. D. (1999). Modern Applied Statistics with S-Plus (Statistics and Computing). Springer, New York, NY.