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Critical values for linearity tests in time-varying smooth transition autoregressive models when data are highly persistent
Sandberg, Rickard, (2008)
Convergence to stochastic power integrals for dependent heterogeneous processes
Sandberg, Rickard, (2009)
Testing for unit roots in nonlinear heterogeneous panels with smoothly changing trends : an application to Scandinavian unemployment rates
Sandberg, Rickard, (2016)