//-->
Long-Run PPP May Not Hold After All.
Engel, C., (1996)
Value-Added Analysis for Cross-Classified Multilevel Data.
Fielding, A., (1998)
Multivariate Tests of Fractionally Integrated Hypotheses.
Gil-Alana, L., (1998)
Nelson and Plosser Revisited: Evidence from Fractional Arima Models.
Testing of Seasonal Fractional Integration in U.K. and Japanese Consumption and Income.