1. Phillips, P.C.B., 1986. "Testing for a Unit Root in Time Series Regression," Cahiers de recherche 8633, Universite de Montreal, Departement de sciences economiques.
   Other versions:
   • Peter C.B. Phillips & Pierre Perron, 1986. "Testing for a Unit Root in Time Series Regression," Cowles Foundation Discussion Papers 795R, Cowles Foundation, Yale University, revised Sep 1987. [Downloadable!]
2. Alberto Alesina & Roberto Perotti, 1996. "Budget Deficits and Budget Institutions," IMF Working Papers 96/52, International Monetary Fund.
   Other versions:
   • Alberto Alesina & Roberto Perotti, 1996. "Budget Deficits and Budget Institutions," NBER Working Papers 5556, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
   • Alberto F. Alesina & Roberto Perotti, 1999. "Budget Deficits and Budget Institutions," NBER Chapters, in: Fiscal Institutions and Fiscal Performance, pages 13-36 National Bureau of Economic Research, Inc. [Downloadable!]
3. Bruce E. Hansen, 2000. "Sample Splitting and Threshold Estimation," Econometrica, Econometric Society, vol. 68(3), pages 575-604, May.
   Other versions:
   • Bruce E. Hansen, 1996. "Sample Splitting and Threshold Estimation," Boston College Working Papers in Economics 319., Boston College Department of Economics, revised 12 May 1998. [Downloadable!]
4. Bertola, Giuseppe & Drazen, Allan, 1993. "Trigger Points and Budget Cuts: Explaining the Effects of Fiscal Austerity," American Economic Review, American Economic Association, vol. 83(1), pages 11-26, March. [Downloadable!] (restricted)
   Other versions:
   • Bertola, G. & Drazen, A., 1991. "Trigger Pointsand Budget Cuts ; Explaining the Effects of Fiscal Austerity," Papers 26-91, Tel Aviv.
   • Bertola, Giuseppe & Drazen, Allan, 1991. "Trigger Points and Budget Cuts: Explaining the Effects of Fiscal Austerity," CEPR Discussion Papers 599, C.E.P.R. Discussion Papers. [Downloadable!] (restricted)
   • Giuseppe Bertola & Allan Drazen, 1991. "Trigger Points and Budget Cuts: Explaining the Effects of Fiscal Austerity," NBER Working Papers 3844, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
5. Mehmet Caner & Bruce E. Hansen, 2001. "Threshold Autoregression with a Unit Root," Econometrica, Econometric Society, vol. 69(6), pages 1555-1596, November. [Downloadable!] (restricted)
   Other versions:
   • Bruce E. Hansen & Mehmet Caner, 1997. "Threshold Autoregressions with a Unit Root," Boston College Working Papers in Economics 381, Boston College Department of Economics. [Downloadable!]
6. Perron, Pierre & Vogelsang, Timothy J, 1992. "Nonstationarity and Level Shifts with an Application to Purchasing Power Parity," Journal of Business & Economic Statistics, American Statistical Association, vol. 10(3), pages 301-20, July.
   Other versions:
   • Vogelsang, T.I. & Perron, P., 1991. "Nonstationary and Level Shifts With An Application To Purchasing Power Parity," Papers 359, Princeton, Department of Economics - Econometric Research Program.
7. Giavazzi, Francesco & Jappelli, Tullio & Pagano, Marco, 2000. "Searching for Non-Linear Effects of Fiscal Policy: Evidence from Industrial and Developing Countries," CEPR Discussion Papers 2374, C.E.P.R. Discussion Papers. [Downloadable!] (restricted)
   Other versions:
   • Francesco Giavazzi & Tullio Jappelli & Marco Pagano, 2000. "Searching for Non-Linear Effects of Fiscal Policy: Evidence from Industrial and Developing Countries," NBER Working Papers 7460, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
   • Giavazzi, Francesco & Jappelli, Tullio & Pagano, Marco, 2000. "Searching for non-linear effects of fiscal policy: Evidence from industrial and developing countries," European Economic Review, Elsevier, vol. 44(7), pages 1259-1289, June. [Downloadable!] (restricted)
8. Denis Kwiatkowski & Peter C.B. Phillips & Peter Schmidt, 1991. "Testing the Null Hypothesis of Stationarity Against the Alternative of a Unit Root: How Sure Are We That Economic Time Series Have a Unit Root?," Cowles Foundation Discussion Papers 979, Cowles Foundation, Yale University. [Downloadable!]
   Other versions:
   • Kwiatkowski, D. & Phillips, P.C.B. & Schmidt, P., 1990. "Testing the Null Hypothesis of Stationarity Against the Alternative of Unit Root : How Sure are we that Economic Time Series have a Unit Root?," Papers 8905, Michigan State - Econometrics and Economic Theory.
   • Kwiatkowski, Denis & Phillips, Peter C. B. & Schmidt, Peter & Shin, Yongcheol, 1992. "Testing the null hypothesis of stationarity against the alternative of a unit root : How sure are we that economic time series have a unit root?," Journal of Econometrics, Elsevier, vol. 54(1-3), pages 159-178. [Downloadable!] (restricted)

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1. Mohammadi, Hassan & Jahan-Parvar, Mohammad R., 2009. "Oil Prices and Exchange Rates in Oil-Exporting Countries: Evidence from TAR and M-TAR Models," MPRA Paper 14578, University Library of Munich, Germany. [Downloadable!]
2. James Payne & Hassan Mohammadi, 2006. "Are Adjustments in the U.S. Budget Deficit Asymmetric? Another Look at Sustainability," Atlantic Economic Journal, International Atlantic Economic Society, vol. 34(1), pages 15-22, March. [Downloadable!] (restricted)
3. Ananda Jayawickrama & Tilak Abeysinghe, 2006. "Sustainability Of Fiscal Deficits: The U.S. Experience 1929-2004," SCAPE Policy Research Working Paper Series 05xx, National University of Singapore, Department of Economics, SCAPE. [Downloadable!]
4. Oscar Bajo-Rubio & Carmen Díaz-Roldán & Vicente Esteve, 2003. "Is the Budget Deficit Sustainable when Fiscal Policy is nonlinear? The Case of Spain, 1961-2001," Economic Working Papers at Centro de Estudios Andaluces E2003/32, Centro de Estudios Andaluces. [Downloadable!]