Sources: https://www.academia.edu/31000315/%D0%9E%D0%A2_MONTANA_%D0%94%D0%9E_%D0%9C%D0%9E%D0%9D%D0%A2%D0%90%D0%9D%D0%90_%D0%95%D0%94%D0%98%D0%9D_%D0%93%D0%A0%D0%90%D0%94_%D0%9C%D0%95%D0%96%D0%94%D0%A3_%D0%94%D0%A0%D0%95%D0%92%D0%9D%D0%9E%D0%A1%D0%A2%D0%A2%D0%90_%D0%98_%D0%9D%D0%90%D0%A1%D0%A2%D0%9E%D0%AF%D0%A9%D0%95%D0%A2%D0%9E
