Here's an interesting paper "A Spectral Analysis of World GDP Dynamics: Kondratieff Waves, Kuznets Swings, Juglar and Kitchin Cycles in Global Economic Development, and the 2008–2009 Economic Crisis"
Korotayev, Andrey V and Tsirel, Sergey V.found at http://escholarship....9jv108xp#page-1
Enjoy!
Geo
