00327nam a2200133Ia 4500008004100000041000800041082002100049100001500070245004600085260002300131300000800154365001600162710001500178230312s9999    xx            000 0 und d  aeng  a004.6b004.6 GUP  aGupta P.C.  aData Communications And Computer Networks  c2009bPHI Learning  a800  cRs.b450.00  aGupta P.C.