[3] S. A. Hosseini, A. K. Mohammad and S. Changiz: Emotional stress recognition system for affective computing based on bio-signals; Journal of Biological Systems, Vol. 18, No. spec01, pp. 101-114 (2010)
[5] M. Kumar, S. Neubert, S. Behrendt, A. Rieger, M.Weippert, N. Stoll, K. Thurow and R. Stoll:Stress monitoring based on stochastic fuzzy analysis of heartbeat intervals; Fuzzy Systems, IEEE Transactions on, Vol. 20, No. 4, pp. 746-759 (2012)