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1. The lattice of separable subalgebras of a radical extension of a connected ring. Bull. Georgian Acad. Sci. 126 (1987), 29-32.

2. Finite Galois extensions of a connected ring in an elementary topos. Bull. Georgian Acad. Sci. 135 (1989), 32-36.

3. Fundamental theorem for finite Galois extensions of an internal commutative connected ring in an elementary topos and the functor T. Tbiliss. Gos. Univ. Inst. Prikl. Mat. Trudy 36 (1990), 9-27.

4. Galois objects in the category of internal commutative algebras in an elementary topos and their flatness. Tbiliss. Gos. Univ. Inst. Prikl. Mat. Trudy 36 (1990), 28-44.

5. Galois theory in a category of modulus over an elementary topos. Bull. Georgian Acad. Sci. 159 (1999), 20-22.

6. Pure morphisms of commutative rings are effective descent morphisms for modules. Theory Appl. Categ. 7 (2000), 38-42.

7. On some properties of pure morphisms of commutative rings. Theory Appl. Categ. 10 (2002), 180-186.

8. Descent theory for schemes. Appl. Categ. Structures (in press).

9. Every small SL-enriched category is Morita equivalent to a SL-monoid. Theory Appl. Categ. (in press).