00316nam a2200121 a 450000500170000002000150001708200220003210000160005424500410007025000080011126000520011930000230017120251203091959.0  a0521270952  a530.0724,bD, squ  aSquires, GL  aPractical physics, G.L. Squires, eng  a3rd  aCambridge, Cambridge University press, GBc1989  axii, 213p,c23 cm.