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​http://www.springerlink.com/content/k801q87183x81115/
​http://cran.r-project.org/doc/contrib/Fox-Companion/appendix-nonlinear-regression.pdf
​http://www2.warwick.ac.uk/fac/sci/statistics/staff/research/turner/gnm/

​http://en.wikibooks.org/wiki/R_Programming/Non_Parametric[[BR]]