Masaki Omata and  Shumma Hosokawa,  Experimental Verification of the Relationship between Physiological Indexes and the Presence or Absence of an Operation during E-learning.   journal   = {International Journal of Educational and Pedagogical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    January 2016, vol. 110(2). 426 - 430
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/10003519.