| 000 | 00355 a2200073 4500 | ||
|---|---|---|---|
| 245 | 0 |
_aCCITT Plenary Assembly (Yellow Book) Geneva, 1980 : _bSpecifications of Signalling Systems R1 and R2, Recommendations Q.310-Q.490 (Study Group XI) / _c. _nVol.VI-4 |
|
| 710 | 2 |
_aInternational Telecommunication Union. _eWydawca _4pbl |
|
| 260 |
_aGeneva : _bITU, _c1981. |
||
| 300 |
_aVIII, 164 s.; _c30 cm. |
||
| 999 |
_c13963 _d13963 |
||