Nonlinear effects and shock formation in the focusing of a spherical acoustic wave - Numerical simulations and experiments in liquid heliumC. Appert, C. Tenaud, X. Chavanne, S. Balibar, F. Caupin and D. d'HumièresEur. Phys. J. B, 35 4 (2003) 531-549DOI: https://doi.org/10.1140/epjb/e2003-00307-0