Paul O'Leary, Manfred Pauritsch, Franco Maloberti, Giampiero Raschetti. An oversampling-based DTMF generator. IEEE Transactions on Communications, 39(8):1189-1191, 1991. [doi]
@article{OLearyPMR91,
title = {An oversampling-based DTMF generator},
author = {Paul O'Leary and Manfred Pauritsch and Franco Maloberti and Giampiero Raschetti},
year = {1991},
doi = {10.1109/26.134006},
url = {http://dx.doi.org/10.1109/26.134006},
researchr = {https://researchr.org/publication/OLearyPMR91},
cites = {0},
citedby = {0},
journal = {IEEE Transactions on Communications},
volume = {39},
number = {8},
pages = {1189-1191},
}