00406nam a22001457a 4500003001200000005001700012008004100029020001500070040001200085082001600097100002100113245006900134260001100203650004600214NUST - PNEC20170116181007.0150912b        xxu||||| |||| 00| 0 eng d  a0470848553  cLIBRARY  a621.382 STU  aStuckmann, Peter  aThe GSM evolution : mobile packet data servicescPeter Stuckmann  cc.2003  aPacket switching (Data transmission)xMIS