@Article{ 
  BraVal20,
  author = { Braides, Andrea and Vallocchia, Valerio },
  title = { Two geometric lemmas for $S^{N-1}$-valued maps and an application to the homogenization of spin systems },
  journal = { COCV },
  year = { 2020 },
  doi = { 10.1051/cocv/2021007 },
  volume = { 27 },
  pages = { 13 },
  URL = { http://cvgmt.sns.it/paper/4860/ },
  note = { cvgmt preprint}
}