Eshboboev Sardor Nurbobo ugli, Rakhmatov Sirozhiddin Eshmakhmadovich, and Nuraliev Novruz Shoymardon ugli. “INVESTIGATION OF THE MICROSTRUCTURE AND HARDNESS OF 20GL STEEL SAMPLES CUT FROM A WEDGE-SHAPED AND A SIDE FRAME AFTER VOLUME-SURFACE QUENCHING”. European Scholar Journal, vol. 2, no. 5, May 2021, pp. 302-9, https://scholarzest.com/index.php/esj/article/view/865.