Hegwood, Natalie, and Papell, David H. "Are real GDP levels trend, difference, or regime-wise trend stationary? Evidence from panel data tests incorporating structural change." http://www.uh.edu/~dpapell/realgdp.pdf
uni-hamburg.de
wiso.uni-hamburg.de
Lucke, Bernd. "Is Germany‘s GDP trend-stationary? A measurement-with-theory approach." "Archived copy"(PDF). Archived from the original(PDF) on 2011-07-08. Retrieved 2010-12-07.{{cite web}}: CS1 maint: archived copy as title (link)
Lucke, Bernd. "Is Germany‘s GDP trend-stationary? A measurement-with-theory approach." "Archived copy"(PDF). Archived from the original(PDF) on 2011-07-08. Retrieved 2010-12-07.{{cite web}}: CS1 maint: archived copy as title (link)