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ucf.edu
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Roberts, Lawrence G. «The evolution of packet switching». Proceedings of the IEEE, 66, 11, 11-1978, pàg. 1307–13. Arxivat de l'original el 2023-02-04. DOI: 10.1109/PROC.1978.11141 [Consulta: 12 febrer 2022]. «Both Paul Baran and Donald Davies in their original papers anticipated the use of T1 trunks»
Roberts, Lawrence G. «The evolution of packet switching». Proceedings of the IEEE, 66, 11, 11-1978, pàg. 1307–13. Arxivat de l'original el 2023-02-04. DOI: 10.1109/PROC.1978.11141 [Consulta: 12 febrer 2022]. «Both Paul Baran and Donald Davies in their original papers anticipated the use of T1 trunks»