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* {{cite journal|url=https://archive.org/details/bstj39-4-995|last1=Deininger|first1=R.L.|title=Human Factors Engineering Studies of the Design and Use of Pushbutton Telephone Sets|journal=Bell System Technical Journal|date=4 Juli 1960|volume=39|issue=4|pages=995–1012}}
* Frank Durda, [http://nemesis.lonestar.org/reference/telecom/signaling/dtmf.html Dual Tone Multi-Frequency (Touch-Tone®) Reference] {{Webarchive|url=https://web.archive.org/web/20110925184759/http://nemesis.lonestar.org/reference/telecom/signaling/dtmf.html |date=2011-09-25 }}, 2006.
* [http://www.itu.int/rec/T-REC-Q.24/en ITU-T Recommendation Q.24 - Multifrequency push-button signal reception]
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