TY  - BOOK
AU  - Richards, D. L
TI  - Telecommunication by speech: the transmission performance of telephone networks
SN  - 040870344x
AV  - TK 6161 Ric 
PY  - 1973///
CY  - London
PB  - Butterworths
KW  - TELEPHONE
N1  - Bibliography: p. 529-577
ER  -