Corakci, Aysegul, et al. “Hysteresis and Stochastic Convergence in Eurozone Unemployment Rates: Evidence from Panel Unit Roots With Smooth Breaks and Asymmetric Dynamics”. Oeconomia Copernicana, vol. 13, no. 1, Mar. 2022, pp. 11-54, doi:10.24136/oc.2022.001.