1. METHODS OF MEASUREMENT OF HARDNESS OF MATERIALS (review)
2. A. V. Strutynsky, S. A. Khudyakov, Comparison of characteristics of small-sized hardness testers, http://www.armada-ndt.ru/articles/8444/
3. GOST 9012-59 Metals and alloys, Brinell hardness measurement method.
4. GOST 9013-59 Metals and alloys, Rockwell hardness measurement method.
5. GOST 2999-75 Metals and alloys, Vickers hardness measurement method.