@Misc{ 
  BalFraPan19,
  author = { Baldi, Annalisa and Franchi, Bruno and Pansu, Pierre },
  title = { {$L^1$-{P}oincar\'e inequalities for differential forms on {E}uclidean spaces and {H}eisenberg groups} },
  journal = {  },
  year = { 2019 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/4223/ },
  note = { cvgmt preprint}
}