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Bell Labs Technical Journal  
Abbreviated title(s) BLTJ
Discipline Electrical engineering, Computer science and Communications
Language English
Publication details
Publisher John Wiley & Sons (USA)
Publication history Published since 1922
ISSN 1089-7089

Bell Labs Technical Journal is the in-house journal for scientists of Bell Labs/Alcatel-Lucent. It is published quarterly by John Wiley & Sons.

The journal has been through several name changes during its lifetime, including the Bell System Technical Journal, AT&T Bell Laboratories Technical Journal and AT&T Technical Journal. The journal was first published as Bell System Technical Journal in 1922.[1]


Famous features

It is most famous for Claude Shannon's paper "A mathematical theory of communication" which founded the field of information theory. Also important are the two Unix-themed issues that appeared in 1978 and 1984, containing many landmark papers from the system's developers.

The journal is also notorious for a November, 1954 article "In-Band Single-Frequency Signaling" (A. Weaver and N. A. Newell) that revealed the internal operation of the long distance switching system in use at that time. This article enabled phone phreaks to develop the Blue Box apparatus that manipulated the switching system to allow them to make free long-distance calls.

2009 Nobel Prize physicists Willard Boyle and George E. Smith described their new Charge Couple Device in the journal: "Charge coupled semiconductor devices." Bell System Technical Journal, 49(4): 587-93, April 1970.


  1. ^ Data from Ulrich's Periodicals Directory.


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