1. Baldi, A., Franchi, B.: Maxwell’s equations in anisotropic media and Carnot groups as variational limits. Adv. Nonlinear Stud. 15, 325–354 (2015)
2. Baldi, A., Franchi, B.: Some remarks on vector potentials for Maxwell’s equations in space-time Carnot groups. Boll. Unione Mat. Ital. (9) 5(2), 337–355 (2012)
3. Baldi, A., Franchi, B.: Sharp a priori estimates for div-curl systems in Heisenberg groups. J. Funct. Anal. 265(10), 2388–2419 (2013)
4. Baldi, A., Bernabei, M., Franchi, B.: A recursive basis for primitive forms in symplectic spaces and applications to Heisenberg groups. To appear in Acta Math. Sin. (Engl. Ser.)
5. Baldi, A., Franchi, B., Pansu, P.: Gagliardo-Nirenberg inequalities for differential forms in Heisenberg groups. hal - 01140910, arXiv 1506.05904