No.4 ESS: Transmission/Switching Interfaces and Toll Terminal Equipment
- 1 September 1977
- journal article
- website
- Published by Institute of Electrical and Electronics Engineers (IEEE) in Bell System Technical Journal
- Vol. 56 (7) , 1057-1097
- https://doi.org/10.1002/j.1538-7305.1977.tb00556.x