<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def normalization(self):
 """ The normalization i.e., the intergral of the function over the normalization_range """

        norm_r = self.normalization_range()        
        return quad(self, norm_r[0]*self._j_ref, norm_r[1]*self._j_ref)[0]