I've translated the following link via babelfish (babelfish.altavista.com), but I was wondering if someone was willing to look up some of the Russian Language references listed at the bottom. 

http://www.vzmakh.ru/parabellum/n10_s6.shtml

If you notice on Korfmann's map (of sling use), you'll see that the entire Russian area is empty. 



Maybe there is some proof otherwise in those references?

Chris