%0 Journal Article %A B. Ahmad; D. P. Challa; M. Kirane; M. Sini %D 2015 %8 Array %P 563-583 %T The equivalent refraction index for the acoustic scattering by many small obstacles With error estimates %V 424 %N 1 %R 10.1016/j.jmaa.2014.11.020 %7 2021/06/02/ %J Journal of Mathematical Analysis and Applications