000			00284nam a2200133Ia 4500
020			_a978818128716
082			_a621.382 ALE
100			_aALENCAR, M.S.
110			_aDAROCHA, V.C.
245			_aCOMMUNICATION SYSTEMS
260			_bSPRINGER _c2007
300			_a416
942			_2ddc _cB
999			_c64021 _d64021