KARGIN, B. S.; KARGIN, S. B. Improvement of the stamping process for car valves. Materials working by pressure, [S. l.], n. 2(49), p. 82–86, 2019. DOI: 10.37142/2076-2151/2019-2(49)82. Disponível em: http://omd.dgma.donetsk.ua/index.php/main/article/view/116. Acesso em: 23 sep. 2025.