TY  - BOOK
AU  - Roddy,Dennis
AU  - Coolen,John
TI  - Electronic communications /  
SN  - 0879092246
PY  - 1977///
CY  - Reston, Virginia : 
PB  - Reston, 
KW  - CIBERNETICA
KW  - TELECOMUNICACIONES
ER  -