00401nam a2200169Ia 4500008004100000020001800041041000800059082001600067100001700083245002200100250001200122260002900134300002500163365001700188500000900205700001700214230718s9999    xx            000 0 und d  a0-471-62056-4  aeng  a621.38bBEL  aBellamy J.C.  aDigital Telephony  a2nd ed.  c1991bWiley Publications  a572dRef 69 E (4177)  cRs.b2368.45  a69 E  aBellamy J.C.