ON THE QUESTION OF POPULAR MOVEMENTS AND INTERNAL OPPOSITION IN FRANCE AT THE TURN OF THE 13TH-14TH CENTURIES Article KEROV V.L. BULGARIAN HISTORICAL REVIEW-REVUE BULGARE D HISTOIRE. PUBL HOUSE BULGARIAN ACAD SCI. 1986. P. 46-60
TRANSVECTOR ALGEBRAS IN THE THEORY OF THE REPRESENTATIONS OF REDUCTIVE LIE-GROUPS Article ZHELOBENKO D.P. Doklady Akademii nauk SSSR. Mezhdunarodnaya Kniga, Moscow, Russian Federation. Vol. 288. 1986. P. 32-35