EXPERIMENTAL STUDY OF NONLINEARITY IN FREE PROGRESSIVE ACOUSTIC WAVES IN AIR AT 20 kHz Dr. J.A. GALLEGO-JUAREZ et L. GAETE-GARRETONJ. Phys. Colloques, 40 C8 (1979) C8-336-C8-340DOI: https://doi.org/10.1051/jphyscol:1979860
