ELHOUSSEYN, Benguettaia; ABBAS, Bouhoreira. The role of research and development in increasing the competitive performance of petroleum companies: A case study of Royal Dutch Shell PLC. The International tax journal, [S. l.], v. 52, n. 5, p. 2545–2556, 2025. Disponível em: https://internationaltaxjournal.online/index.php/itj/article/view/264. Acesso em: 19 apr. 2026.