000 00287nam a22001337a 4500
020 _aNA
082 _222
_a621.380413
100 _aProakis John G.
245 _aDigital communications /
250 _a2nd
260 _aMGH
_bMGH
_cc1990
300 _a164p,;
_bNA
_c24cm.
942 _2ddc
_cIT
999 _c2682
_d2682