AUTONOMY IN THE RUSSIAN FEDERATION: THEORY AND PRACTICE ArticleKartashkin V.A., Abashidze A.Kh.International Journal on Minority and Group Rights. Том 10. 2003. С. 203-220
GEOMETRICAL INVESTIGATIONS OF UMBRELLA SURFACES ArticleKrivoshapko S.N.Строительная механика инженерных конструкций и сооружений. 2005. С. 11-17