Hatem NAJAR About a result of S.M. Kozlov (766K, ps, dvi, pdf) ABSTRACT. We 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 $\displaystyle H_\omega=-\nabla\rho_\omega\nabla$, at the bottom of the spectrum.