TWO GENERALISED THEORIES DESCRIBING LIGHT DIFFRACTION BY ULTRASONIC PULSES :A. GENERATING-FUNCTION METHODB. LAPLACE-TRANSFORM METHOD K. VAN DEN ABEELE et O. LEROYJ. Phys. Colloques, 51 C2 (1990) C2-1235-C2-1238DOI: https://doi.org/10.1051/jphyscol:19902290