000 00288nam a2200109Ia 4500
008 220120s9999||||xx |||||||||||||| ||und||
100 _aDas, sumithabha
245 0 _aUnix :concepts and applications.
260 _aTata Mc-Graw hill
_c2006
300 _a160
_b0
650 _aTELECOMMUNICATION
999 _c136801
_d136801