Feb 07 2012 Chih-kai Chang and Tsangyao Chang   Revisiting the sustainability of current account deficit: SPSM using the panel KSS Test with a Fourier Function   Abstract  Contact Information  Citation  Full Text  -  Note   Aug 21 2008 Veli YILANCI   Are Unemployment Rates Nonstationary or Nonlinear? Evidence from 19 OECD Countries   Abstract  Contact Information  Citation  Full Text  -  Preliminary Result