000 00304nam a2200121Ia 4500
008 220201s1991 xx 000 0 eng d
041 _aENG
100 _aGUPTA, J B
245 0 _aELECTRONICS COMMUNICATION
260 _aLONDON
_bTHAMES AND HUDSON PUBLISHING COMPANY
_c1991
300 _a788
942 _2ddc
999 _c56783
_d56783