1. GOST (State Standard) 24856–2014: Pipeline Valves. Terms and Definitions, Moscow: Standartinform, 2015.
2. GOST (State Standard) 12.2.063–2015: Pipeline Valves. General Safety Requirements, Moscow: Standartinform, 2016.
3. Materials for the manufacture of pipeline fittings, Armatek. http://armatek.ru/about/truboprovodnaya_armatura/materialy. Accessed February 1, 2019.
4. Chudakov, E.A., Mashinostroenie (Machine Engineering), Moscow, 1947, vol. 4, section 2.
5. Perepletchikov, E.F., Mechanized surfacing of cobalt alloys in reinforcement engineering, Tekhnol. Obrab. Poverkhn., 2011, no. 15, pp. 64–67.