**NEW ** June 2014 ... The Evolution of the Back of the GSD - The German Shepherd Dog
I found this link on a breeder's Facebook page. I have not fully read it, but have read a good portion of it and I find it interesting. It appears to discuss the evolution of the German Shepherd Dog in show lines, and discusses how and why the curvy back element was developed on.
I find it very interesting and maybe some of you German Shepherd lovers might want to have a look. Enjoy!