congresses
(
40
)
periodicals
(
32
)
telecommunication
(
31
)
engineering
(
20
)
publicaciones periódicas
(
20
)
telephone
(
20
)
electronic journals
(
15
)
electrical engineering
(
13
)
electronics
(
13
)
united states
(
13
)
science
(
12
)
business, economy and management
(
10
)
history
(
10
)
computers
(
9
)
equipment and supplies
(
9
)
périodiques
(
9
)
technology
(
9
)
communication
(
8
)
computer networks
(
8
)
design
(
8
)
general and others
(
8
)
handbooks, manuals, etc
(
8
)
information technology
(
8
)
life sciences
(
8
)
telephone companies
(
8
)
design and construction
(
7
)
fast
(
7
)
management
(
7
)
optical communications
(
7
)
telecommunication systems
(
7
)