1. R. A. Adams and J. J. F. Fournier, Sobolev Spaces, Elsevier, Amsterdam, 2003.
2. C. O. Alves, G. Ercole and G. A. Pereira, Asymptotic behavior as p → ∞ of least energy solutions of a (p, q(p))-Laplacian problem, Proc. Roy. Soc. Edinburgh Sect. A 149 (2019), 1493–1522.
3. T. Bhattacharya, An elementary proof of the Harnack inequality for non-negative infinity-superharmonic functions, Electron. J. Differential Equations 2001.44 (2001), 1–8.
4. T. Bhattacharya, E. DiBenedetto and J. Manfredi, Limits as p → ∞ of Δpup = f and related extremal problems, Rend. Sem. Mat. Univ. Politec. Torin Fascicolo Speciale (1989), 15–68.
5. M. Bocea and M. Mihăilescu, Existence of nonnegative viscosity solutions for a class of problems involving the ∞-Laplacian, NoDEA Nonlinear Differential Equations Appl. 23 (2016), Article no. 11.