Self-organization of ultrasound in viscous fluids V. J. Sánchez-Morcillo, J. Martínez-Mora, I. Pérez-Arjona, V. Espinosa and P. Alonso EPL, 92 1 (2010) 10003 Published online: 22 October 2010 DOI: 10.1209/0295-5075/92/10003