Inclusion properties of Orlicz and weak Orlicz spaces
  In this paper we discuss the structure of Orlicz spaces and weak Orlicz spaces on $\mathbb{R}^n$. We obtain some necessary and sufficient conditions for the inclusion property of these spaces. One of the keys is to compute the norm of the characteristic functions of the balls in $\mathbb{R}^n$. 
Al Azhary Masta, Hendra Gunawan and Wono Setya Budhi
math.FA