VARAHRAMI, V. Effects of R&D Costs on Profit of Producers of Oil Productions in Tehran Stock Exchange. Journal of Social and Administrative Sciences, [S. l.], v. 2, n. 3, p. 132–134, 2015. Disponível em: https://journals.econsciences.com/index.php/JSAS/article/view/428. Acesso em: 28 jan. 2026.