Edoardo Amaldi Stefano Coniglio Leonardo Taccari Formulations and heuristics for the k-Piecewise Affine Model Fitting problem. 48-51 2011 CTW http://ctw2011.dia.uniroma3.it/ctw_proceedings.pdf#page=60 conf/colognetwente/2011 db/conf/colognetwente/colognetwente2011.html#AmaldiCT11