Dumanyan, V. Zh. 2023. “ON THE ESTIMATION OF $\{|\triangledown u|^2dx$ FOR SOLUTIONS OF SECOND ORDER ELLIPTIC EQUATIONS”. Proceedings of the YSU A: Physical and Mathematical Sciences 42 (2 (216): 145-47. https://doi.org/10.46991/PYSUA.2008.42.2.145.