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
SOLUBILITY OF THULIUM, YTTERBIUM AND LUTECIUM HYDROXIDES IN POTASSIUM HYDROXIDE SOLUTIONS СтатьяIVANOVEMIN B.N., MALYUGINA S.G., BORZOVA L.D., DOLGANEV V.P., ZAITSEV B.E., EGOROV A.M.ЖУРНАЛ НЕОРГАНИЧЕСКОЙ ХИМИИ. Том 21. 1976. С. 1208-1213