@article{econhot_econhot-cited-c5c8e3ac782b6849, title = {Nonstationarity and Level Shifts With an Application to Purchasing Power Parity}, author = {Pierre PerrĂ³n and Timothy J. Vogelsang}, journal = {Journal of Business and Economic Statistics}, year = {1992}, volume = {10}, number = {3}, pages = {301-320}, doi = {10.1080/07350015.1992.10509907}, url = {https://doi.org/10.1080/07350015.1992.10509907} }