AUTONOMY IN THE RUSSIAN FEDERATION: THEORY AND PRACTICE СтатьяKartashkin V.A., Abashidze A.Kh.International Journal on Minority and Group Rights. Том 10. 2003. С. 203-220
SYNTHESIS AND THERMAL-STABILITY PRASEODYMIUM AND ERBIUM HYDROXYBROMIDES СтатьяBARSUKOVA I.S., DUDAREVA A.G., TSIKHINDINI S.ЖУРНАЛ НЕОРГАНИЧЕСКОЙ ХИМИИ. Том 39. 1994. С. 1960-1961