1. Adams R.A. (1975). Sobolev Spaces. Academic, NewYork
2. Aharouch L., Azroul E. and Benkirane A. (2002). On the L ∞-regularity of solutions of nonlinear elliptic equations in Orlicz spaces. Electron. J. Differ. Equat. Conference 09: 1–8
3. Azroul E., Benkirane A. and Tienari M. (2000). On the regularity of solutions to the Poisson equations in Orlicz spaces. Bull. Belg. Math. Soc. 7(1): 1–12
4. Chen, Y., Wu, L.: Second Order Elliptic Equations and Elliptic Systems(in chinese). Science Press, Beijing (1990)
5. Cianchi, A.: Some results in the theory of Orlicz spaces and applications to variational problems. Nonlinear analysis, function spaces and applications. 6(Prague), pp. 50–92(1998). Acad. Sci. Czech. Repub., Prague (1999)