FOCUSED ACOUSTIC BEAM IN NON LINEAR MEDIUM N. S. BADHVALOV, R. V. KHOKHLOV, E. A. ZABOLOTSKAJA et I. M. ZHILEIKINJ. Phys. Colloques, 40 C8 (1979) C8-56-C8-61DOI: https://doi.org/10.1051/jphyscol:1979812