Dumanyan, V. Zh. “ON THE ESTIMATION OF $\{|\triangledown u|^2dx$ FOR SOLUTIONS OF SECOND ORDER ELLIPTIC EQUATIONS”. Proceedings of the YSU A: Physical and Mathematical Sciences 42, no. 2 (216) (September 19, 2023): 145–147. Accessed July 22, 2024. https://journals.ysu.am/index.php/proceedings-phys-math/article/view/vol42_no2_2008_p145-147.