Zhukovych І. A. R&D Spending: The Methodological Framework for Measurement and Global Tendencies in R&D Financing. Statistics of Ukraine, [S. l.], v. 105, n. 2, p. 35–45, 2024. Disponível em: https://su-journal.com.ua/index.php/journal/article/view/440. Acesso em: 8 jun. 2026.