1. �. G. Aslanyan and A. S. Doinikov, Zakonodat. Prikl. Metrolog., No. 4, 38 (2002).
2. L. N. Bryanskii, A. S. Doinikov, and B. N. Krupin, Metrology. Scales, Standards and Practice [in Russian], Izd. VNIIFTRI, Moscow (2004).
3. State Standard GOST 8.064-94. GSI, The State Checking Scheme for Hardness Measuring Instruments Based on the Rockwell and Super-Rockwell Scales.
4. State Standard GOST 8.062-85. GSI, The State Special Standard and State Checking Scheme for Hardness Measuring Instruments Based on the Brinell Scales.
5. State Standard GOST 8.063.79. GSI, The State Special Standard and All-Union Checking Scheme for Hardness Measuring Instruments Based on the Vickers Scales.