00382nam a2200133 a 450000500170000000800410001704100080005808200100006610000230007624500670009926400490016630000110021565000220022620260717091249.0260717s1981    ii            000 0 eng d  aeng04a515.91 aSpiegel, Murray R.10aTheory and Problems of Complex variables /cSpiegel, Murray R. 1aNew York :bMcgraw Hill Book Company,c1981.  a313 p. 4acomples variables