Yurianto, Y., P. Pratikto, R. Soenoko, and W. Suprapto. “Effect of Quench and Temper on Hardness and Wear of HRP Steel (armor Steel Candidate)”. Eastern-European Journal of Enterprise Technologies, vol. 3, no. 12 (99), May 2019, pp. 55-61, doi:10.15587/1729-4061.2019.156799.