00422nam a2200133 a 450000500170000002000150001708200160003210000180004824500840006626000480015030000250019849000430022370000220026620251203110233.0  a0521337429  a515.45bPOR  aPorter, David  aIntegral equationsba practical treatment, from spectral theory to applications  aCambridgebCambridge university pressc1996  axii,372p.c22cm. PB.  aCambridge texts in applied mathematics  aStirling, Davis S