1. A. Velikov, S. Stanev, A. Maneva, R. Angelov, “Gas pressing” (“GP”) - a method of obtaining pistons for internal combustion engines”, in Proceedings of the III Scientific and Educational Conference “Mechanical Engineering-Traditions and Innovations” (MIT-2010), (November-December, Moscow), pp. 53–55 (2010), (in Russian).
2. A. Velikov, S. Bushev, “Foundry-gas pressing method”, International Journal “NDT Days” II(2), pp. 224–229 (2019).
3. R. Slavov, A. Velikov, V. Gurbalov, “Influence of pressure and heat treatment on the high temperature strength of pistons obtained by the “gas pressing” method”, IV National Youth Scientific School with International Participation Materials Science and Materials Obtained in the Conditions of Gas Counterpressure, Proceedings I, Varna, pp. 37–43 (1990), (in Bulgarian)
4. MAHLE GmbH, Pistons and Engine Testing, ATZ/MTZ-Fachbuch (Vieweg+Teubner Verlag, Wiesbaden, 2012).
5. System for materials testing at static loading