DIFFERENTIAL PROPERTIES OF FUNCTIONS OF A SPHERE ArticleZHIDKOV G.V.Differential Equations. Vol. 19. 1983. P.. 1525-1535
S-ALGEBRAS AND VERMA MODULES OVER REDUCTIVE LIE-ALGEBRAS ArticleZHELOBENKO D.P.Doklady Akademii nauk SSSR. Vol. 273. 1983. P.. 785-788