Jari Oksanen, F. Guillaume Blanchet, Roeland Kindt, Pierre Legendre, 
   Peter R. Minchin, R. B. O'Hara, Gavin L. Simpson, Peter Solymos, 
   M. Henry H. Stevens, Helene Wagner
MASS, mgcv, cluster, scatterplot3d, rgl, tcltk
Ordination methods, diversity analysis and other
  functions for community and vegetation ecologists.