Tontchev, Nikolay, et al. “MULTI-CRITERIA RESEARCH OF GEOMETRIC, MECHANICAL, ENERGETIC ANDTEMPORAL INDICATORS DEPENDING ON LASER HARDENING PARAMETERS”. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference, vol. 3, June 2024, pp. 449-55, https://doi.org/10.17770/etr2024vol3.8183.