@Misc{ 
  FloNitTro17,
  author = { Floridia, Giuseppe and Nitsch, Carlo and Trombetti, Cristina },
  title = { Multiplicative controllability for nonlinear degenerate parabolic
  equations between sign-changing states },
  journal = {  },
  year = { 2017 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/3698/ },
  note = { cvgmt preprint}
}