## The authors would like to thank the following people
## for ideas, discussions, testing and feedback:

Doris Altmann
Johannes Bracher
Johannes Dreesman
Johannes Elias
Mayeul Kauffmann
Marc Geilhufe
Jim Hester
Kurt Hornik
Marcos Prates
Brian D. Ripley
Barry Rowlingson
Christopher W. Ryan
Klaus Stark
Yann Le Strat
André Michael Toschke
Wei Wei
George Wood
Achim Zeileis
Bing Zhang
