1. S. Chen, A. Fiscella, P. Pucci, and X. Tang, Coupled elliptic systems in ℝn with (p,N) Laplacian and critical exponential nonlinearities, Nonlinear Anal. 201 (2020), 112066.
2. W. S. Cohn, N. Lam, G. Lu, and Y. Yang, The Moser-Trudinger inequality in unbounded domains of Heisenberg group and sub-elliptic equations, Nonlinear Anal. 75 (2012), no. 12, 4483–4495.
3. N. Lam, G. Lu, and H. Tang, Sharp subcritical Moser–Trudinger inequalities on Heisenberg groups and subelliptic PDEs, Nonlinear Anal. 95 (2014), 77–92.
4. N. Lam and G. Lu, Sharp Moser–Trudinger inequality on the Heisenberg group at the critical case and applications, Adv. Math. 231 (2012), no. 6, 3259–3287.
5. N. Lam, G. Lu, and H. Tang, On nonuniformly subelliptic equations of Q-sub-Laplacian type with critical growth in the Heisenberg group, Adv. Nonlinear Stud. 12 (2012), no. 3, 659–681.