[3] Benkirane, A., Val, M. Ould Mohamedhen: 
Some approximation properties in Musielak-Orlicz-Sobolev spaces. Thai J. Math. 10 (2012), 371-381. 
MR 3001860 | 
Zbl 1264.46024 
[7] Hudzik, H.: 
A generalization of Sobolev spaces. II. Funct. Approximatio, Comment. Math. 3 (1976), 77-85. 
MR 0467279 | 
Zbl 0355.46011 
[9] Kamińska, A.: 
Some convexity properties of Musielak-Orlicz spaces of Bochner type. Rend. Circ. Mat. Palermo, II. Ser. Suppl. 10 (1985), 63-73. 
MR 0894273 | 
Zbl 0609.46015 
[13] Krasnosel'skiĭ, M. A., Rutitskiĭ, J. B.: 
Convex Functions and Orlicz Spaces. P. Noordhoff, Groningen (1961). 
MR 0126722 | 
Zbl 0095.09103 
[14] Kufner, A., John, O., Fučík, S.: 
Function Spaces. Monographs and Textbooks on Mechanics of Solids and Fluids. Mechanics: Analysis, Noordhoff International Publishing, Leyden; Academia, Prague (1977). 
MR 0482102 | 
Zbl 0364.46022 
[16] Nakano, H.: 
Modulared Semi-Ordered Linear Spaces. Tokyo Math. Book Series 1, Maruzen, Tokyo (1950). 
MR 0038565 | 
Zbl 0041.23401