In this paper we prove the equidistribution of the restriction of the mass of automorphic newforms to a nonsplit torus in the depth aspect. This result is better than the current known results on the similar problem in the eigenvalue aspect. The method is relatively elementary and makes use of the known effective QUE result in the depth aspect.
"Mass equidistribution on the torus in the depth aspect." Algebra Number Theory 14 (4) 927 - 946, 2020. https://doi.org/10.2140/ant.2020.14.927