Chubaryan, A. A. “ON THE MINIMAL SEQUENTIAL CALCULI OF ROBINSON’S ARITHMETIC”. Proceedings of the YSU A: Physical and Mathematical Sciences 36, no. 3 (199) (September 20, 2002): 20–22. Accessed January 21, 2026. https://journals.ysu.am/index.php/proceedings-phys-math/article/view/vol36_no3_2002_pp020-022.