Expert Logics. - George Gargov; Slavian Radev (AIMSA, 1986)

Determinism and Looping in Combinatory PDL. - George Gargov; Solomon Passy (Theor. Comput. Sci., 1988)

Modal logic with names. - George Gargov; Valentin Goranko (J. Philos. Log., 1993)

An Approach to Uncertainty via Sets of Truth Values. - George Gargov (Notre Dame J. Formal Log., 1995)

Elements of intuitionistic fuzzy logic. Part I. - Krassimir T. Atanassov; George Gargov (Fuzzy Sets Syst., 1998)

Knowledge and Uncertainty and Ignorance in Logic: Bilattices and beyond. - George Gargov (J. Appl. Non Class. Logics, 1999)