2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/57911We give an alternative proof and improve upon a result of S.M. Kozlov \cite{ko}. It deals with the asymptotic of the integrated density of states of the acoustic operator $\displaystyle H_ω=-\nablaρ_ω\nabla$, at the bottom of the spectrum.14Mathematical PhysicsSpectral Theory81Q10; 35P05; 37A30;47F05text