  Let $f$ be a Petersson normalized Hecke-Maass cusp form with spectral
parameter $t\geq 2$ and let $\mathcal{C}_{D}$ be the union of closed geodesics
in $\text{Sl}_{2}(\mathbb{Z})\setminus \mathbb{H}$ associated to a fundamental
discriminant $D>0$. Following a suggestion by Sarnak in his letter to Reznikov,
we express the restriction norm $||f|_{\mathcal{C}_{D}}||_{2}^{2}$ as a
weighted sum of central values of L-functions using Waldspurger's formula. This
allows us to get an unconditional improvement over the current bounds.
