DIFFERENTIAL PROPERTIES OF FUNCTIONS OF A SPHERE Статья ZHIDKOV G.V. Differential Equations. Том 19. 1983. С. 1525-1535
S-ALGEBRAS AND VERMA MODULES OVER REDUCTIVE LIE-ALGEBRAS Статья ZHELOBENKO D.P. Doklady Akademii nauk SSSR. Mezhdunarodnaya Kniga, Moscow, Russian Federation. Том 273. 1983. С. 785-788