http://www.dainst.org/index_596_en.html
http://books.google.com/books?id=e1PNO7urjHQC&pg=PA231&lpg=PA231&dq=kurgan+five+%2B+felt&source=bl&ots=Y_AyHUfhVk&sig=mhBcBakVrdjZjxJ0KyhPMUuyViQ&hl=en&ei=UsO2ScerI-PetgeTkIWmCQ&sa=X&oi=book_result&resnum=9&ct=result
http://www.s155239215.onlinehome.us/turkic/btn_Archeology/Kurgan_CultureEn.htm