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No copy here. That study is still available in some specialized libraries in Germany and Belgium. It's nice enough to know it exists, owning does not really make my life better. --[[User:Fverhart|Fverhart]] 14:40, 22 June 2007 (CEST)
There is another study from the 70s from california: http://www.digihitch.com/sections-viewarticle-43.html --[[User:MrTweek|MrTweek]] 14:20, 25 June 2007 (CEST)