2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/28098We calculate the energy level statistics in a two-dimensional disc with diffusive boundary scattering by the means of the recently proposed ballistic nonlinear sigma-model.5 pages, 2 figures submitted to Phys. Rev. BMesoscale and Nanoscale PhysicsDisordered Systems and Neural Networkstext