1. A note on a problem by Ricceri on the Ambrosetti-Rabinowitz condition;Anello, Giovanni;Proc. Amer. Math. Soc.,2007
2. Lions-type compactness and Rubik actions on the Heisenberg group;Balogh, Zoltán M.;Calc. Var. Partial Differential Equations,2013
3. Springer Monographs in Mathematics;Bonfiglioli, A.,2007
4. Nonlinear elliptic inequalities with gradient terms on the Heisenberg group;Bordoni, Sara;Nonlinear Anal.,2015
5. Collection Math\'{e}matiques Appliqu\'{e}es pour la Ma\^{\i}trise. [Collection of Applied Mathematics for the Master's Degree];Brezis, Haïm,1983