http://englishrussia.com/2013/10/19/kazan-helicopter-factory/
http://www.aero-news.net/index.cfm?do=main.textpost&id=b8c878a1-5bf6-4af9-b294-fe0c038f271e
http://www.aero-news.net/index.cfm?do=main.textpost&id=d4721943-2fe4-4886-b016-b8209a9f960a