Concrete examples of $\mathscr{H}(b)$ spaces
  In this paper we give an explicit description of de Branges-Rovnyak spaces $\HH(b)$ when $b$ is of the form $q^{r}$, where $q$ is a rational outer function in the closed unit ball of $H^{\infty}$ and $r$ is a positive number. 
Emmanuel Fricain, Andreas Hartmann (IMB), William T. Ross
math.CV