Absorption filter correction by spectral shifts of ultrasonic propagation in nonlinear attenuating media M. G. S. Ali, N. Z. El-Sayed, N. A. Kamel and A. Raouf Mohamed Eur. Phys. J. AP, 20 2 (2002) 129-132 Published online: 25 October 2002 DOI: 10.1051/epjap:2002082