6N. Abuaf, P.Jorion. Purchasing power parity in the long run. The Journal of Finance, 45 (1990): 57-174.
7Keun-Yeob Oh. Purchasing power parity and unit root tests using panel data. Journal of International Money and Finance. 1996, 15 (3): 405-418.
8Sarah E.Culver, David H.Papell. Long-run purchasing power parity with short-run data: evidence with a null hypothesis of stationatity. Journal of International Money and Finance. 1993 (18), 751-767
9Kuan, C. M. And Liu, T. Forecasting exchange rates using feed forward and recurrent neural networks.Journal of Applied Econometrics. 1995, 10: 347-64.
10N. Abuaf, P. Jorion. Purchasing Power Parity in the Long Run. The Journal of Finance. 1990, 45:57-174.