Enrique Castillo Ali S. Hadi Beatriz Lacruz Rosa Eva Pruneda Semi-parametric nonlinear regression and transformation using functional networks. 2129-2157 2008 52 Computational Statistics & Data Analysis 4 http://dx.doi.org/10.1016/j.csda.2007.07.006 db/journals/csda/csda52.html#CastilloHLP08