1. [1] Baldi, Annalisa; Franchi, Bruno; Pansu, Pierre Poincaré and Sobolev inequalities for differential forms in Heisenberg groups (2017) (https://arxiv.org/abs/1711.09786)
2. [2] Baldi, Annalisa; Franchi, Bruno; Pansu, Pierre L 1 -Poincaré inequalities for differential forms on Euclidean spaces and Heisenberg groups (2019) (https://arxiv.org/abs/1902.04819)
3. Compensated compactness in the contact complex of Heisenberg groups;['Baldi, Annalisa', 'Franchi, Bruno', 'Tesi, Maria C.'];Indiana Univ. Math. J.,2008
4. New estimates for elliptic equations and Hodge type systems;['Bourgain, Jean', 'Brezis, Haïm'];J. Eur. Math. Soc.,2007
5. Subelliptic Bourgain–Brezis estimates on groups;['Chanillo, Sagun', 'Van Schaftingen, Jean'];Math. Res. Lett.,2009