1. On Provability Logic of HA.
2. Relative Unification in Intuitionistic Logic: Towards provability logic of HA
3. Unification types in Euclidean modal logics. Logic Journal of the IGPL. (Joint with M. Alizadeh, M. Ardeshir and P. Balbiani)
4. The $$\Sigma_1$$-Provability Logic of HA Revisited. Preprint:
5. Hard Provability Logics.  In Mathematics, Logic, and their Philosophies (pp. 253-312). Springer, Cham. Preprint:
6. Unification in the Implicative Fragment of Boolean Logic. Logic Journal of the IGPL. (joint with Philippe Balbiani) Preprint:
7. The $$\Sigma_1$$-Provability Logic of HA*. Journal of Symbolic Logic,  Volume 84, Issue 3, Pages 118-1135, 2019 (joint with M. Ardeshir) Preprint:
8. Localizing Finite-Depth Kripke ModelsLogic Journal of the IGPL, Volume 27, Issue 3, May 2019, Pages 239–251. Preprint:
9. The $$\Sigma_1$$-Provability Logic of HA, submitted 2016. Annals of Pure and Applied Logic, Volume 169, Issue 10, Pages 971-1116, October 2018. (joint with M. Ardeshir) Preprint :
10. Reduction of provability logics to $$\Sigma_1$$-provability logics, Logic Journal of the IGPL, Volume 23, Issue 5, pages 842-847, February 2015. (joint with M. Ardeshir) Preprint:
11. Completeness of intermediate logics with doubly negated axioms, Mathematical Logic Quarterly, Volume 60, Issue 1-2, pages 6–11, February 2014. (joint with M. Ardeshir) Preprint:
12. The de Jongh property for Basic Arithmetic, Archive for Mathematical Logic, Volume 53, Issue 7-8, pages 881-895, February 2014. (joint with M. Ardeshir) Preprint: