Mandar A. Rahurkar John H. L. Hansen James Meyerhoff George Saviolakis Michael Koenig Frequency band analysis for stress detection using a teager energy operator based feature. 2002 INTERSPEECH http://www.isca-speech.org/archive/icslp_2002/i02_2021.html conf/interspeech/2002 db/conf/interspeech/interspeech2002.html#RahurkarHMSK02