Smoothing Methods for Nonparametric Regression and Density
Estimation
Adrian Bowman and Adelchi Azzalini. 
         Ported to R by B. D. Ripley <ripley@stats.ox.ac.uk> up to version 2.0,
	     version 2.1 by Adrian Bowman and Adelchi Azzalini,
	     version 2.2 by Adrian Bowman.
rgl, misc3d, akima, gam, tkrplot, rpanel (>= 1.1-4), tcltk
This is software linked to the book
  'Applied Smoothing Techniques for Data Analysis -
  The Kernel Approach with S-Plus Illustrations' Oxford University Press.