000 00324pam a2200133a 44500
008 160408b1976 xxu||||| |||| 00| 0 eng d
020 _a0335061028
082 _a621.38
_bOP2T
100 _a
245 1 _aTELECOMMUNICATION SYSTEMS
260 _a
_bThe Open University Press
_c1976
964 _gCIRC
997 _aA70996 s C
999 _c283208
_d283208