@Article{ 
  BiaBon17,
  author = { Bianchini, Stefano and Bonicatto, Paolo },
  title = { Failure of the chain rule in the non steady two-dimensional setting },
  journal = { Current Research in Nonlinear Analysis: In Honor of Haim Brezis and Louis Nirenberg },
  year = { 2018 },
  doi = { 10.1007/978-3-319-89800-1_2 },
  pages = { 33-60 },
  URL = { http://cvgmt.sns.it/paper/3617/ },
  note = { cvgmt preprint}
}