S. L. Happy Anirban Dasgupta 0002 Priyadarshi Patnaik Aurobinda Routray Automated Alertness and Emotion Detection for Empathic Feedback during e-Learning. 47-50 2013 T4E https://doi.org/10.1109/T4E.2013.19 https://doi.ieeecomputersociety.org/10.1109/T4E.2013.19 conf/t4e/2013 db/conf/t4e/t4e2013.html#HappyDPR13