00325nam a2200133 a 450000500170000002000150001708200180003210000150005024500260006526000300009130000260012149000340014763000100018120251203090448.0  a0852747934  a531.1133bBUC  aBuckley, R  aOscillations and wave  aBostonbAdam Hilgerc1985  aviii,56 p.b22cm.bPB  aStudent monographs in physics  aWaves