1. 6) J. K. Harter, et al. : Business-Unit-Level Relationship Between Employee Satisfaction, Employee Engagement, and Business Outcomes: A Meta-Analysis, Journal of Applied Psychology, 87, 2 (2002) 268.
2. 8) J. Watanabe, et al.: Relationship between Physical Behaviors of Students and Their Scholastic Performance, 2013 IEEE 10th International Conference on Ubiquitous Intelligence & Computing and 2013 IEEE 10th International Conference on Autonomic & Trusted Computing, (2013) 170.
3. 9) D. O. olguin, et al. : Sensible organizations: Technology and methodology for automatically measuring organizational behavior, IEEE Transactions on Systems, Man, and Cybernetics, Part B (Cybernetics), 39, 1 (2009) 43.
4. 11) K. Yano, et al. : Profiting from IoT: the key is very-large-scale happiness integration, 2015 Symposium on VLSI Technology (2015).
5. 12) A. Pentland: HONEST SIGNALS, The MIT Press, (2010).