TY  - BOOK
AU  - Gayler, Winston D.,
TI  - Telephone voice transmission: Standards and measurement 
SN  - 0139027769
AV  - TK6169 G39
PY  - 1989///
CY  - Englewood cliffs, new jersey
PB  - Prentice Hall
KW  - Teléfono
KW  - Normas
ER  -