MINIMAL K-TYPES AND CLASSIFICATION OF IRREDUCIBLE REPRESENTATIONS OF REDUCTIVE LIE-GROUPS Article ZHELOBENKO D.P. Functional Analysis and its Applications. Vol. 18. 1984. P. 333-335
UNIVERSAL MODULES OF CLASS 0 OVER SEMISIMPLE LIE-ALGEBRAS Article ZELOBENKO D.P. Functional Analysis and its Applications. Vol. 14. 1980. P. 232-233