Wu, Hequan (6 August 2002). "The progress of communication technology subject of hi-tech research development plan of China". WCC 2000 - ICCT 2000. 2000 International Conference on Communication Technology Proceedings (Cat. No.00EX420). Vol. 1. Beijing. pp. 3–4. doi:10.1109/ICCT.2000.889157. ISBN0-7803-6394-9. S2CID60832883.{{cite book}}: CS1 maint: location missing publisher (link)
Wu, Hequan (6 August 2002). "The progress of communication technology subject of hi-tech research development plan of China". WCC 2000 - ICCT 2000. 2000 International Conference on Communication Technology Proceedings (Cat. No.00EX420). Vol. 1. Beijing. pp. 3–4. doi:10.1109/ICCT.2000.889157. ISBN0-7803-6394-9. S2CID60832883.{{cite book}}: CS1 maint: location missing publisher (link)