Silvia Santano Guillén and  Luigi Lo Iacono and  Christian Meder,  Affective Robots: Evaluation of Automatic Emotion Recognition Approaches on a Humanoid Robot towards Emotionally Intelligent Machines.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    April 2018, vol. 138(6). 584 - 592
    [viewed 05 August 2020]. Available from: https://publications.waset.org/pdf/10009027.