@Article{ 
  Tio22,
  author = { Tione, Riccardo },
  title = { Critical points of degenerate polyconvex energies },
  journal = { SIAM J. Math. Anal. },
  year = { 2022 },
  doi = { https://doi.org/10.1137/22M1519018 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/5479/ },
  note = { cvgmt preprint}
}