J. Dias, I. Traore, V. Ferreira, J. Ardigo, and C. De Rolt.
" Exploratory Use of PPG Signal in Continuous Authentication", in <em>Proceedings of the 15th Brazilian Symposium on Information and Computational Systems Security</em>, Florianópolis, 2015, pp. 142-155, doi: <a href="https://doi.org/10.5753/sbseg.2015.20091">https://doi.org/10.5753/sbseg.2015.20091</a>.