00309nam a22001217a 4500020001800000040000900018082001800027100002100045245002700066250001700093260005000110650002700160  a9788129703507  cNust  a621.3845bSCH  aJochen Schiller   aMobile communications   a2nd Edition   aNew York:bPearson education services,c2003.  aMobile communications