Urinov Nasillo Fayzilloevich, Sokhibov Ibodullo Adizmurodovich, and Amonov Mahmud Idris Ugli, “STUDY THE HARDNESS AND FIRMNESS INDEXES OF THIN LAMELLATE KNIVES”, Galaxy int. interdiscip. res. j., vol. 9, no. 11, pp. 356–362, Nov. 2021.