Digital time-division switching systems
1979 ◽
Vol 27
(7)
◽
pp. 1138-1143
◽
1989 ◽
Vol 5
(4)
◽
pp. 39-43
◽
1990 ◽
Vol 20
(1-5)
◽
pp. 377-382
◽
2017 ◽