Lv, Xiaoxiao, et al. “Mu-Stability Criteria for Nonlinear Differential Systems With Additive Leakage and Transmission Time-Varying Delays”. Nonlinear Analysis: Modelling and Control, vol. 23, no. 3, June 2018, pp. 380-0, https://doi.org/10.15388/NA.2018.3.6.