00250nam a2200109Ia 4500008004100000041000800041082000800049100001600057245005000073260000900123300000800132211209s1975    xx            000 0 und d  aeng  aSAI  aSAIHGAL R L  aOSCILLATIONS AND WAVES ACOUSTICS AND OPTICS.   c1975  a413