Okay, I spent a little time over at the Russian TOW site. There are some links there to historical reference materials in Russian, which eventually led me to an academic article on the history of the Stug III. This may not be what you are looking for, but it mentioned that a large number of these guns were captured by the Soviets at the end of the war, and that "until the early 1990s, they were referred to by the name "Artshturm" (Артштурм in Cyrillic). Apparantly, the term originated from an incorrect translation of the German word "Sturmgeschütz."
In case someone is interested, here is a link to the article: http://armor.kiev.ua/Tanks/WWII/StugIII/1/stug3_1.php