1. 3GPP TR 26.935 V8.0.0 Technical Report. 2008. 3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Packet-switched conversational multimedia applications; Performance characterisation of default codecs (Release 8). Retrieved May 1 2019 from https://www.arib.or.jp/english/html/overview/doc/STD-T63v9_10/5_Appendix/Rel8/26/26935--800.pdf 3GPP TR 26.935 V8.0.0 Technical Report. 2008. 3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Packet-switched conversational multimedia applications; Performance characterisation of default codecs (Release 8). Retrieved May 1 2019 from https://www.arib.or.jp/english/html/overview/doc/STD-T63v9_10/5_Appendix/Rel8/26/26935--800.pdf
2. Extended bandwidths in hearing aids;Beck Doug L.;Hearing Review,2008
3. Paired Comparisons of Nonlinear Frequency Compression, Extended Bandwidth, and Restricted Bandwidth Hearing Aid Processing for Children and Adults with Hearing Loss
4. James R. Bress Steven Whitesell and Tony Jasionowski. 2013. Telecommunications Industry Association (TIA): Developing Standards for Accessibility. Presented to the TR-41.3.14 Accessibility Working Group. Retrieved May 1 2019 from http://standards.tiaonline.org/standards_/committees/documents/DevelopingStandardsForAccessibility.pdf James R. Bress Steven Whitesell and Tony Jasionowski. 2013. Telecommunications Industry Association (TIA): Developing Standards for Accessibility. Presented to the TR-41.3.14 Accessibility Working Group. Retrieved May 1 2019 from http://standards.tiaonline.org/standards_/committees/documents/DevelopingStandardsForAccessibility.pdf