An introduction to the theory random signals and noise / Wilbur B. Davenport and William L. Root
Glossary of telecommunication terms : english - arabic - french - spanish / International Telecommunication Union
ENV 41901 : June 1987 / European Commitee for Electrothecnical Standardization
Telecommunications in turmoil [policopiado] : technology and public policy / Gerald R. Faulhaber
World communications : ways and means to global integration / ed. Gaston Lionel Franco