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APASmart Define. (1970). dual-tone multi-frequency signal thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/dual-tone_multi-frequency_signal/thesaurus/broader
ChicagoSmart Define. 1970. "dual-tone multi-frequency signal thesaurus" https://smartdefine.org/dual-tone_multi-frequency_signal/thesaurus/broader (accessed September 24, 2026).
HarvardSmart Define 1970, dual-tone multi-frequency signal thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/dual-tone_multi-frequency_signal/thesaurus/broader>.
MLASmart Define. "dual-tone multi-frequency signal thesaurus" 1 January 1970. Web. 24 September 2026. <https://smartdefine.org/dual-tone_multi-frequency_signal/thesaurus/broader>