Grigoryan D. ON MAIN CANONICAL NOTION OF $ \delta $-REDUCTION. Proc. YSU A: Phys. Math. Sci. [Internet]. 2018 Dec. 17 [cited 2024 Sep. 19];52(3 (247):191-9. Available from: https://pub.ysu.am/index.php/proceedings-phys-math/article/view/vol52_no3_2018_pp191-199